All consumers are also called this

Herbivores and heterotrophic

Secondary primary consumers are primary carnivores.

3° consumer are secondary carnivore

If we are talking about like people buying things, then they are called customers, but if we are talking about the food chain then the first answer would be right :)

b is the correct answer

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.