During the evolution of animals , bilateral summetry accompanied cephalization . suggest a reason for this

Q: The brain and spinal cord develop from a longitudinal ectodermal channel called the _____.

A: Brain and the spinal cord consists of the central nervous system of the body and the nervous system…

Q: Which form of reproduction can result from damage to the original animal? a. asexual b.…

A: Reproduction (or multiplication or rearing) is the natural cycle by which new individual creatures –…

Q: The location of a cell during gastrulation plays a role in determining the cells fate in the…

A: The process of embryonic development during which the embryo having a single layer of cells called…

Q: In a developing chicken embryo, what mesoderm lines the amniotic cavity?

A: The amnion, chorion, yolk sac, and allantois are the four extraembryonic membranes found in amniotes…

Q: Reproductive in animals

A: Reproduction is the process of production of own kinds by organisms.

Q: The bladder like structure in the amniotic egg

A: The allantois (plural allantoides or allantoises) is an empty sac-like design loaded up with clear…

Q: The beginning of brain and spinal cord formation is termeda. cephalocaudal folding.b.…

A: Gastrulation process is characterized by formation of three primary germ layers, they are ectoderm,…

Q: Parthenogenesis isa. the process by which the germ layers form.b. involved in the formation of the…

A: Reproduction is the process by which living beings produce their own kind.

Q: How does oviposition occurs in female turtles. Provide the pathway involved in the oviposition…

A: Answer :- As we know that Males have a couple of penises that pass sperm from their cloaca to the…

Q: Differentiated Differentiated cells in a developing embryo derive from

A: The development of an embryo occurs in different layers. Every cell in the body have different…

Q: Compare and contrast neurulation and organogenesis

A: NEURULATION Following the gastrulation , the ectoderm gives rise to the epithelial and neural…

Q: In humans, implantation in the uterus occurs at whichstage of embryonic development?a. zygoteb.…

A: An embryo is an unborn offspring in the steps of development. It is part of the life cycle. It is…

Q: Compare the structures of the egg and sperm. What structural modifications do sperm have that…

A: The process of producing new organisms from the pre-existing ones is called reproduction. It may be…

Q: Eventually the amniotic cavity is surrounded by a double-layered membrane called the…

A: The amniotic cavity is the cavity which is the closed sac between the embryo and the amnion and…

Q: Why does continued breastfeeding decrease the chance of pregnancy? (Hint: Think about the effect the…

A: Hormones are the organic substances that are produced in small amounts by specific glands, which are…

Q: Explain the way in which the egg gets prepared for fertilization during oogenesis.

A: The process through which the male and female gametes combine to create the zygote is known as…

Q: Which primary germ layer gave rise to the cells that eventually became the central nervous system?…

A: Introduction  Life starts from single cell called Zygote. Zygote is the single diploid cell resulted…

Q: If the egg is not fertilized in mammals, the endometrium is shed as

A: Introduction: The inner layer is the endometrium. During a woman's menstrual cycle, hormones cause…

Q: Create a diagram showing the evolution of the urogenital system for the seven vertebrate classes.

A: The urogenital system is meant by the urinary as well as the genetal or reproductive system. The…

Q: Which structure helps to expel the baby during labor? a. myometrium b. cervix c. endometrium d.…

A: In human females, the gestation period is about 9 months and the baby is delivered after this period…

Q: Gastrulation in birds and mammal

A: Gastrulation is the process during embryonic development that changes the embryo from a blastula…

Q: Umbilical cord contains A allantois B yolk sac C arteries veins

A: The umbilical cord is a stretchable, tubular  structure which joins the fetus to the mother during…

Q: During embryonic development, unique cell layers develop into specific groups of tissues or organs…

A: The development of a plant or animal embryo is called embryogenesis. This process starts with the…

Q: Newborns are at much higher risk for dehydration thanadults. Why?

A: A baby which is 2 months old from his or her birth is considered newborns.

Q: Occasionally, two primitive streaks form in one embryonic disk. Predictthe result. What happens if…

A: Primitive streak : A primitive streak is defined as a transient structure that forms during the 15…

Q: between  which  two consecuative stages did fertilization occur

A: Fertilization is a cell-to-cell interaction mechanism that takes place among two unique cells: a…

Q: When a woman breastfeeds, milk letdown can occur in the breast thatis not being suckled. Explain how…

A: Lactation refers to the process by which there is synthesis of milk by the mammary glands of a…

Q: Poor embryonic development occurs because ____________________________.

A: After fertilization, a single celled diploid zygote is formed, which later develops into…

Q: In animal gamely he did, a single primary spermatocyte generates blank sperm, while single primary…

A: The meiosis is the cell division process by which a diploid (2n) mother cell divides its nucleus…

Q: Compare and contrast gametogenesis in starfish and sea urchin.

A: Answer--

Q: Explain elwhy there is a high level of estrogen and progesterone once in every 28-day uterine cycle…

A: The ovarian cycle governs the preparation of endocrine tissues and release of eggs, while the…

Q: Finding the size of a sea urchin embryo

A: Determining the size of sea urchin embryo

Q: Illustrate an egg in early cleavage, distinguish this stage from thise that follow (2,4,8 cell…

A: In developmental biology, several stages are there which determines the development of the fetus…

Q: Assess the function of the uterine horns of the pig.

A: Anatomy can be defined as a branch of biology that is associated with the study of the organism’s…

Q: igment in bottom layer? A. melatonin B. melanin C. mesoderm D. ectoderm

A: Biological pigments are chemical substances that produce color in living organisms, like plant…

Q: Which form of reproduction is useful to an animal with little mobility that reproduces sexually? a.…

A: Answer is d.)  hermaphroditism.

Q: Elaborate on the oviposition process of female turtles. Provide the pathways included in the…

A: INTRODUCTION Any reptile having a bony shell, including tortoises, is classified as a turtle in…

Q: Place the number corresponding to the correct germ layer in the blank.   ____ Mesoderm ____…

A: During gastrulation, the hollow sphere of balls called blastula develops into a gastrula.…

Q: Based on what you know about the goal of gastrulation, suggests the direct developmental consequence…

A: Embryonic development is the process of development of an embryo.  Gastrulation is a process that…

Q: During the evolution of animals bilateral summetry accompanied cephalisation suggest a reason for…

A: The process of cephalization is considered an evolutionary trend in which the sensory organs, mouth,…

Q: The process by which the structure labeled B is released from the structure labeled A is known as?…

A: The picture is showing the female reproductive system. It consists of ovary(A), Fallopian tube (C),…

Q: True or false male sea urchins release sperm at the optimal concentration for fertilization

A: There are many challenges for sea urchins in order to fertilizer gametes under water. They undergo…

Q: Explain the way in which the yolk amount affects the cleavage. Compare the Cleavage in a sea star…

A: Yolk  Yolk is a nutrient rich part of the egg which support the growth of developing embryo.

Q: How does amount of yolk affect cleavage? Compare cleavage in a sea star with that in a bird

A: Fertilization is the process of fusion between haploid male and female gametes to form diploid…

Q: The embryo below exhibits cleavage. radial bilateral spiral O modified

A: During developmental periods single cell zygote is transform into multicellular embryo by the…

Q: enzymes. teratogens. placentas. neural networks.

A: chronic and extreme stress faced by a pregnant female may result in the abortion or problems in the…

Q: Occasionally, two-headed animals such as this turtle are born.Thinking about the occurrence of…

A: Introduction In the rare scenario more than one child can be born to a human female in a single…

Q: The Embryonic stem cells can be derived from _______ which is developed by  “invitro…

A: The egg cell fuses with the sperm cell to form the zygote. The zygote develops into an embryo where…

Q: Events that occur from fertilization to the development of an embryo in animals

A: Answer: Introduction: Embryonic development in animals is also known as embryogenesis, is the growth…

Q: Expound how the mass of inert yolk influences gastrulation in amphibians, reptiles and mammals.

A: Answer  All these animals belong to vertebrate and vertebrates, possess much more amount of yolk as…

Animal Diversity

Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.

Platyhelminthes

Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.