The key innovation that helped sporophyte

dominant plants survive in dry environments is
a. spores.
b. the cuticle.
c. xylem.
d. phloem.
e. lignin.


A

Biology & Microbiology

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Atomic nuclei contain protons and _______.

A. moles B. neutrons C. isomers D. ions

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Translocation in sieve tubes requires active transport

Indicate whether the statement is true or false.

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The base of the detrital food chain is formed by

A) primary producers. B) decomposers. C) herbivores. D) dead organic matter.

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What is true for both male and female gametogenesis? (Choose all that apply.)

A. Gametes develop in the gonads. B. Gametes are produced by meiosis. C. Each primary cell results in four gametes. D. Primary cells are haploid.

Biology & Microbiology