What is the tissue origin of the following: Placoid Scales Cosmoid Scales Ganoid scales Cycloid scales Ctenoid scales

Q: Compared to other actinopterygians, teleosts _____. reach sexual maturity later in life and live…

A: Actinopterygian refers to bony fishes which appeared during the Triassic period (50.6 million years…

Q: Compare and contrast the external anatomy of the branched and unbranched forms of Equisetum.

A: Equisetum, often known as the 'horsetail' or'scouring rush,' is now made up of approximately 30…

Q: Which of the following are used by spiders to pick up sensory information from the surrounding…

A: Senses are very important in perceiving the changes in the outer world. Spiders are arachnids that…

Q: What is the basic anatomy of a flatworm (scolex, proglottids)

A: Ans. Taxonomy is the science of the classification of organisms. Each species found so far has been…

Q: The anteriormost nonsegmental body region of an annelid is the prostomium acron O pygidium O…

A: Phylum annelida exhibits great diversity of body form, body is elongated bilateral symmetrical and…

Q: Terminal unicellular part of ascogonium in Eurotium is known as…

A: Answer is c.) trichogyne.

Q: Both bilateral symmetry and cephalization are synapomorphies of Bilateria. O True O False

A: Ans- True  Explanation- Most of the animals have either bilateral or radial symmetry. Majority of…

Q: Label the parts of these rotifers and acanthocephalans Acanthocephalan

A: Labeled parts are shown in step 2. These are parasitic worms and it contains spines.

Q: What invertebrate groups exhibit hydrostatic skeletons? What is the importance of the hydrostatic…

A: Invertebrates are those which do not have vertebral column.

Q: Which cells give tentacles of Gonionemus their rough surface?

A: Phylum Cnidaria of the animal kingdom includes radially symmetrical organisms with two primary germ…

Q: Area pellucida vs area opaca in terms of sizes and shapes: 13 hours 18 hours 21 hours

A: The embryonic stage in chick is a stage when the fetus is in the developing zone. These is the stage…

Q: Difference between hexapod and chelicerae in structure and function

A: Hexapoda is a subphylum consisting most species of arthropods and includes the insects. Hexapods…

Q: Hearing in sauropsids differs from that in synapsids in that sauropsids _____ .     can hear a…

A: Sauropsida ("lizard faces")  belong to class Reptilia. Sauropsida is the a sister taxon to…

Q: The presences of which of the following anatomicals would best distinguish a gastropod from a…

A: An organism refers to a living thing that has an organized structure which can react to stimuli,…

Q: Which of the following is not a synapomorphy of craniates?

A: Craniates are a group of chordates that includes many organisms that have a cranium or a braincase.…

Q: Which of the following classes has/have spicules that lack an axial filament? a. Demospongiae and…

A: Classes in phylum porifera -  Calcispongiae Hyalospongiae Demospongiae These are classified on the…

Q: COLUMELLA: present or absent; well developed or not; Form:

A: Columellae: skeletal structures at the central axis of corallites.

Q: What type of scale is found in Scoliodon?

A: Scoliodon is a marine shark , also known as Dog fish due to it's dog like protruded snout . Phylum…

Q: dentify and label the parts of the following specimens of Phylum Annelida:

A: Phylum Annelida includes all the segmented worms and lacks vertebral columns hence are…

Q: similarities and differences of Hemichordata    and    Chordata

A: The hemichordates are very primitive, while chordata are more advanced group of animals. The very…

Q: Spicules are formed by Scleroblasts Silicoblasts Scleroblasts Calcoblasts

A: The animal kingdom is classified into 11 phyla on the basis of fundamental features like circulatory…

Q: Having _______ is a synapomorphy of bilaterians.

A: Having 3 germ layers is a synapomorphy of bilaterians

Q: Which part of opuntia is modified to form spines?

A: Plants do not show locomotion, so in order to survive in the environment, they undergo several…

Q: Identify and elaborate or briefly define the special features (or unique organ/s) of each of the…

A: Introduction: Phylum echinoderm includes animals with an endoskeleton of calcareous ossicles. They…

Q: sea star oral 5.The ____________ __________________ is a circular tube that connects to each of the…

A: Echinoderms are a phylum of marine invertebrates that include starfish, brittle stars, sea…

Q: Insect cuticle is the characteristic feature of class insecta and is to a large extent responsible…

A: Insect body wall ( also called as Integument and exoskeleton) provides the external covering of the…

Q: State 4 morphological differences between the class Oedipodiopsida and class Andreaeobryopsida

A: The morphological differences between the class Oedipodiopsida and class Andreaeobryopsida are as…

Q: general terrestrial chelicerae features

A: Chelicerata: Chelicerata are the subphylum  phylum Arthropoda. Normally these group of organism are…

Q: Characteristics of annlida

A: Introduction: Every single animal, from the smallest of insects to the blue whale is classified into…

Q: The defining feature of the cnidarians is that they all have nematocytes (cnidocytes). These cells;

A: Cnidaria is a phylum of aquatic animals with about 11000 species. Cnidarians can be both marines as…

Q: Identify and label the parts of the following specimens of Phylum Cnidaria:

A: Cnidaria  Cnidaria is the phylum of animal kingdom. The species of this phylum are aquatic both…

Q: The class of annelid worms which differs from all other classes of annelid worms in that it lacks an…

A: Phylum name: Annelida, commonly known as segmented worm, is a phylum of invertebrates that includes…

Q: QUESTION 2:  Define the following: Parapodia: Chaetae: Metanephridium: Septa:

A: All the given formations are found in annelids.

Q: What is the characteristics of head of a common frog (Polypedates leucomystax)?Based on the given…

A: Polypedatus leucomystax , also called the common tree frog or the four-lined tree frog. This species…

Q: What do you mean by trabeculae?

A: INTRODUCTION:- Trabecula  provides support  in various organs such as heart,penis,and spleen.

Q: 36. What is the mouth apparatus of this organism? probocis mandible chelicerae Olabellum

A: Hemiptera  is an order of insects, commonly called true bugs, comprising over 80,000 species within…

Q: Describe the differences between the two pairs of wings of hexapods (appearance & function).

A: Comparative anatomy is the study of the "similarities and dissimilarities" between various objects.…

Q: Nerve plexus (networks) are characteristic of cnidarians and ctenophores. True O False

A: -A plexus derived from the latin word "braid" consists of network of blood vessels or nerves. -The…

Q: Isopod external anatomy: Label the structures from the manual 1 = 2 = 3 = 4 = %3D 4 2

A: Idopod is an insect found in the arthropods class. They have exoskeleton made upof chitin.

Q: Diapsids possess a single temporal ópening in their Skulils true false Other:

A: Diapsids are a group of amniote tetrapods. Modern diapsids include lizards, snakes, turtles, birds,…

Q: How are the dorsal and ventral surfaces differentiated in a preserved, adult earthworm? The dorsal…

A: The earthworm is the nocturnal crawling organism that belongs to phylum Annelida. The earthworm has…

Q: Which of the following structures are analogous? Cat legs: Dog legs   Penguin fin: Pigeon wing…

A: INTRODUCTION Analogous structures are the features of different species of organisms they have…

Q: Hello, good day. I have a problem answering this question, and I need your help. Hoping for a…

A: Physical features of Aedes aegyptiAedes aegypti is a small, dark mosquito. It is differentiated from…

Q: True or False. The body surface (tegument) of trematodes and cestodes is composed of non-living…

A: Introduction:- Cestodes are parasitic worms belonging to the Cestoda taxonomic group. Cestodes are a…

Q: Which of the following is FALSE regarding lamellipodia? their formation is stimulated by…

A: Lamellipodia are branched actin filaments that provide support for plasma membrane protrusion during…

Q: Define the classification you chose 2. List important features of this classification 3. Give some…

A: BASIC INFORMATION BIOMOLECULES  These are the molecules that are made up of the biological elements…

Q: What would be present in Spongebob's poriferan skeleton? Specify the chemical composition as well as…

A: The SpongeBobs poriferan Skeletal  structure  are containing spicules and spongin fibres. Skeleton…

Anatomical Position

Anatomical position refers to the position in which an individual faces forward with their upper limbs stretched to both sides with palms facing forward. The standard anatomical position of the body is used to reference other anatomical aspects of the body.