Which of the following is a shell-less mollusk?

A. a nudibranch
B. a scallop
C. a pulmonate gastropod
D. a chiton
E. a squid


A

Biology & Microbiology

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A key step in the evolution of vascular plants was the ability to produce ____, a strengthening polymer in the walls of

cells that function for support and conduction a. cutin b. chitin c. lignin d. actin e. cellulose

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A type of Archaea, known as ________, use hydrogen gas to reduce carbon dioxide to methane.

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

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A (n) _____ is an autotroph

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