What is the group of the phylum Chordata that first colonized the terrestrial environment? From which habitat did they come?

Q: What is direct development? Is there a larval stage in planarias?

A: Animal development starts with a fertilization of egg and it undergoes two types of development,…

Q: Why are echinoderms used as indicator species in marine environments?

A: Echinoderms are marine organisms that belong to the phylum Echinodermata. The name is derived from…

Q: The phylum Platyhelminthes has what type of symmetry?

A: Phylum Platyhelminthes are belonging to Kingdom Animalia. This phylum is composed of 13,000 species.

Q: Can organisms in the class Cephalopoda successfully compete versus humans? Is there a possibility…

A: Class Cephalopoda comes under the phylum Mollusca. Organisms under class Cephalopoda are exclusively…

Q: What features make placozoans interesting from a phylogenetic perspective?

A: The phylum Placozoa is a basal form of free-living multicellular organism. It consists of a small…

Q: What character unites members of clade Gnathifera?

A: There exist different types of organisms that are placed according to the characteristic features…

Q: What is phylum-echinodermata with its diagram?

A: The phylum Echinodermata belong to the animal kingdom. The members of this phylum have endoskeleton…

Q: Write the Scientific name of nematode that attacks the root of tobacco plant?

A: The nematodes are also called as roundworms. It constitute the phylum Nematoda (also called…

Q: What problems were associated with colonizing land during the evolution of vertebrates?

A: Life on Earth first developed in quite a while over 3.5 billion years prior, and even today most of…

Q: What genetic changes led to the increasing complexity of the arthropod body plan?

A: Answer- Arthropods are among the most adapted phyla on the planet. There are many factors…

Q: What is the main evolutionary innovation presented by nematodes? What is the advantage of that…

A: Nematodes are bilaterally symmetrical, elongated organisms which play a vital ecological roles as…

Q: What structural system is unique to the phylum Echinodermata?

A: Echinoderms:              Marine invertebrate animals characterized by a hard, spiny covering or…

Q: What is unique about the madreporite of sea cucumbers (class Holothuroidea)?

A:

Q: Hemichordata is a small aberrant group which was earlier placed with chordata. Give reason.

A: Taxonomy is a branch of science involved with classification, particularly of organisms;…

Q: Does coelom present in bilateria?

A: A celom is the hallow cavity which is filled with celomic fluid present between the intestinal canal…

Q: What era did Australopithecus afarensis evolve?

A: It is required to identify the era in which Australopithecus afarensis evolve.

Q: Where do Petromyzon and ammocoetes live?

A: Biodiversity is the diversity in living organisms that exists in a particular region or area. It…

Q: Does the lack of a digestive system in tapeworms indicate that it is a primitive, ancestral form of…

A: Introduction: Platyhelminthes are organisms having a single opening to the digestive cavity. They…

Q: What characters unite rotifers and acanthocephalans as members of clade Syndermata?

A: Animal phylogeny is a rapidly changing field for the biologists. Even if the members of animal…

Q: In which organism is Archaegoniophore present?

A: Marchantia belongs to the family Marchantiaceae of the order Marchantiales. It is a group of…

Q: What are zoospores?

A: Motile spore that is asexual and uses its flagella for its locomotion is known as zoospores.Zoospore…

Q: What phylum is the closest relative of nemertines? Why?

A: Nemertines:  Nemertea, sometimes known as ribbon worms or proboscis worms, is a phylum of organisms.…

Q: What factors support the placement of phoronids and brachiopods as sister taxa?

A: The tree phyla-Phoronida, Ectoprocta, and Brachiopoda-possess a crown of ciliated tentacles, called…

Q: What is the difference in the mode of locomotion between orders Chiroptera and Dermoptera

A: Chiroptera and Dermoptera are two orders of bats that are different from each other with certain…

Q: Why do you think Paranthropus became extinct? What is your evidence?

A: Paranthropus is an extinct hominin containing two main species that is P. robustus and P. boisei.

Q: What is the sister group to the Tetrapoda clade?

A: A sister group or sister taxon is a phylogenetic term denoting the closest relative(s) of another…

Q: What are the importance of trematodes/flukes in ecology?

A: * Trematoda is class belongs to phylum Platyhelminthes with including two groups of parasitic…

Q: How are members of clade Clitellata distinguished from other annelids?

A: All the animal species on Earth are classified into different phyla or groups. They are classified…

Q: What is the name of the larva of corals and sea anemones? What is the biological importance of that…

A: Corals belong to the class Anthozoa of the phylum Cnidaria.  They are marine invertebrates and are…

Q: the tunicate and lancelet that we observed in lab belong to the phylum:

A: Tunicate These are commonly called sea squirts, are a group of marine animals that spend most of…

Q: Considering all you have read regarding nemertines, what phylum do you think is their closest…

A: During the course of evolution animals with Slender and cylindrical bodies were created and these…

Q: Are all ‘choanates’ also amniotes?  Are all amniotes in the group Choanata?

A: Introduction: Any animal affiliated to the subfamily Vertebrata, the most common subphylum of the…

Q: Into which classes is the phylum Annelida divided?

A: Annelids are also known as segmented worms or ringed worms. Annelids are a large phylum, with more…

Q: How have modifications in the feeding appendages of arthropods helped them thrive successfully on…

A: The earth is dominated by arthropods that are eucoelomate protostomes. There exist around 0.8…

Q: What kind of tools did Australopithecus robustus have that researchers believe were used to dig into…

A: Introduction: A group of fossil hominins known as the "robust" australopiths lived in East and…

Q: How is the biology of onychophorans related to their distribution?

A: Onychophora , commonly known as velvet worms. They are terrestrial invertebrates.

Q: Which group of echinoderms has a biradial symmetry and tube feet all over its body?

A: Tube feet are one of the little adaptable or flexible cylindrical processes which present in the…

Q: How is the biology of onychophorans related to their distribution?

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

Q: What is the natural habitat of insects?

A: The members of phylum Arthropoda are collectively referred to as arthropods. Segmented body, the…

Q: What are amphisbaenians? What morphological adaptations do they have to aid in burrowing?

A: Reptiles are the tetrapod organisms and include lizards, snakes, crocodilians, and amphisbaenians.…

Q: What do fossil tetrapods tell us about the transition from water to land?

A: The animals that have 4 limbs are known as tetrapods and constitute the superclass Tetrapoda which…

Q: Which are the beings that form the kingdom Protista?

A: Kingdom Protista is usually referred to as a mixed kingdom as it has a variety of organisms.

Q: Give three differences between Petromyzon and ammocoetes?

A: Petromyxon also known as lamprey is a jawless fish. It is a parasite and thus known as parasitic…

Q: What habitat is shared by micrognathozoans and gnathostomulids?

A: Members of two of the bilaterally symmetrical triploblastic phyla have acoelomate bodies. A coelom…

Q: to what kingdom do the termites belongs?

A: The termites are detritus feeders or detritivores. They feed on dead plants and trees. They obtain…

Q: How abundant are archaeons in the oceans?

A: Archaea is a separate domain of unicellular organisms. These organisms do not have nuclei in their…

Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.