The flukes and tapeworms are covered by a protective

a. cuticle.
b. shell.
c. scales.
d. slime layer.


b

Biology & Microbiology

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Transmembrane movement of a substance with a concentration gradient, with no involvement of membrane proteins, is called ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

What term describes an innate response to a simple and specific stimulus?

a. imprinting b. instinct c. learned behavior d. habituation e. a conditioned response

Biology & Microbiology

What is x in tetraploid oysters?

A) 5 B) 10 C) 20 D) 40

Biology & Microbiology

The first animals evolved ________.

A. 600 thousand years ago B. 6 thousand years ago C. 600 million years ago D. 60 thousand years ago

Biology & Microbiology