Can you guys tell me these all animals mode of nutrition Pisces-
Catfish, Shark, Fish, Seahorse, Electric eel
Amphibia-
Wall lizard, Salamander, Flying lizard, Hippopotamus, Frog
Reptilia-
Snake, Alligator, Crocodile, Tortoise
Aves-
Penguin, Sparrow, Eagle, Kingfisher, ostrich
Mammalia-
Human, Cat, Dog, Whale, Dolphin

If you are the first to answer I will mark you as braininess but the answer must be correct

   As per my full understanding,

There are two main modes of nutrition:

    Autotrophic – Plants exhibit autotrophic nutrition and are called primary producers. Plants synthesis their food by using light, carbon dioxide and water.

   Heterotrophic – Both animals and human beings are called heterotrophs, as they depend on plants for their food.

              WHEREBY: TERMS IN THIS TWO SETS ARE:

   Chemohetrotroph. Gets energy from chemicals and carbon from other sources.

   Photohetrotroph. Gets energy from light and carbon from other sources.

   Chemoautotroph. Gets energy from chemicals and produces its own carbon.

   Photoautotroph. Gets energy from light and produces its own carbon.

i think the answer is a.keratin is the pigment responsible for skin color.