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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

The first cells were formed approximately ___________ years ago.

a. 3 million years ago b. 3 billion years ago c. 2 billion years ago

Biology & Microbiology

Life first evolved in and the earliest forms of life lived in ________

Fill in the blank(s) with correct word

Biology & Microbiology