Question

a. According to the evidence, the animal kingdom is a .

paraphyletic group.

polyphyletic group.

monophyletic group.

b. Mammals and birds eat much more often than reptiles do. Which of the following traits shared by mammals and birds best explains this habit?
endothermy

large body size

amniotic egg

terrestrial

c. Which bird characteristic evolved specifically as an adaptation to flight?

four limbs

feathers

loss of heavy teeth

amniotic egg

d. Animals are unique within the supergroup Unikonta because .

animals have multicellular bodies.

animals can synthesize the structural carbohydrate chitin.

animals have a unique myosin-synthesis pathway.

animal cells are embedded in a protein matrix.

Answer 1

Answer:

(a) Monophyletic group

A Monophyletic group consists of all the related animals along with their common ancestor. Polyphyletic group include animals of unrelated origin. A paraphyletic group is same as monophyletic group but it excludes one or more taxas. Since animal kingdom includes all the taxas and common ancestor, it can be considered as a monophyletic group.

(b) Endothermy

Birds are mammals are endothermic in nature i.e. they maintain a specific body temperature no matter what the environment is. So they need constant supply of energy to maintain that. However the crocodile is a cold blooded animal. It doesn't need to do that, so there is less frequent consumption of food.

(C) Forelimbs (if it is four limbs, it still remains same)

Forelimbs of birds are modified as wings ,which is the major characteristics required for flight. Feathers ,and loss of heavy teeth were secondary adaptation to provide heat and weight loss respectively. Amniotic eggs doesn't help for flight it rather helps in succesful breeding.

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