In the nitrogen cycle, which of the following involves bacteria converting nitrates into nitrogen gas?
a. denitrification
b. nitrification
c. ammonification
d. eutrophication
a. denitrification
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One of the earliest evolutionary adaptations that helps plants to retain water in a terrestrial environment is ______________
A. the leaf B. the xylem C. the phloem D. the root E. the cuticle
Polyploidy is more common in plants than in animals. Why?
a. Animals reproduce sexually, plants do not. b. Many plants can either self-fertilize or reproduce asexually, or both, but animals cannot. c. Plants have more chromosomes than animals. d. Plants have shorter life spans than do animals. e. Animals are more complex than plants.
The first cells were formed approximately ___________ years ago.
a. 3 million years ago b. 3 billion years ago c. 2 billion years ago
Life first evolved in and the earliest forms of life lived in ________
Fill in the blank(s) with correct word