Membrane-bound organelles are not found in the cells of

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine