In the surface waters of oceans, the two most limiting nutrients for primary productivity are
A) sulfur and phosphorus.
B) sulfur and nitrogen.
C) nitrogen and iron.
D) nitrogen and phosphorus.
C
Biology & Microbiology
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One of the advantages seeds have over spores is that they can delay germination until conditions are favorable for growth
A. true B. false
Biology & Microbiology
Which began first?
A. Multicellular life in the ocean B. Animals colonizing the land C. Multicellular life in fresh water D. Plants colonizing the land
Biology & Microbiology
Ozone in the ________ comprises a thin layer that protects the surface of Earth from ultraviolet radiation
Fill in the blank(s) with correct word
Biology & Microbiology
Which of the following has a nucleoid region?
a. Animal cell
b. Prokaryotic cell
c. Virus
d. Eukaryotic cell
e. Plant cell
Biology & Microbiology