Question

In which group, are animals more alike
A. Mammals
B. Birds
C. Amphibians
D. Reptiles.

Answer 1

All animals are eukaryotic, multicellular organisms, and most animals have complex tissue structure with differentiated and specialized tissue. Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal.

Complete answer:
To answer this question, first, we need to know about the features of the animal kingdom. But individuals of the animal kingdom are distinctly varied, most animals have some features that differentiate them from individuals in different kingdoms. All animals are eukaryotic multicellular organisms, and most of the animals have a complicated tissue composition with distinguishable and specific tissues. Most animals are movable, at least during their life spans. All animals need an origin of food and so they are known as heterotrophic, consuming other living or dead organisms. This characteristic differentiated them from autotrophic organisms like many plants that can synthesize their own food via the process of photosynthesis.
Now, let us find the solution from the option.
Among all the groups of animals, Birds or Aves are more similar in characteristics with each other.
Following are the characteristics of birds which are seen in all the birds of this group:

They have waterproof skin and the skin is covered in feathers.
They are endothermic or warm-blooded, or they can maintain their body heat more than their surrounding environment.
They have beaks or bills and do not have teeth.
All birds are bipedal, that is, they walk on two legs.
Their forelimbs are developed into wings.
They have hollow bones, these help in lessening their weight and hence with the help of their wings, most of the birds fly easily.
But in groups of mammals, amphibians and reptiles do not have much similarity among their own species.

Thus, the correct option is B. i.e. Birds.

Note: All animals are as heterotrophs, animals may be carnivores, herbivores, omnivores, or parasites. Most animals propagate sexually with the offspring transferring via sequences of growth phases that establish a permanent body structure. The body plan determines the morphological structure of an animal, recognized via growth sign.