The most common limit to plant growth is a lack of
a. phosphorous.
b. carbon.
c. hydrogen.
d. oxygen.
e. nitrogen.
E
Biology & Microbiology
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Which of these animals uses positive pressure breathing?
A. reptiles B. mammals C. amphibians D. birds
Biology & Microbiology
Which biome is located where a freshwater river meets an ocean?
a. estuary b. stream c. source water d. channel
Biology & Microbiology
The metabolic reactions that occur in all cells require a certain molecule that was also believed to be present very early on Earth. What is this molecule?
a. nitrogen b. carbon c. water d. oxygen e. hydrocarbon
Biology & Microbiology
The facial features seen in the child pictured here are characteristic of what syndrome?
1.Down syndrome
2.Trisomy 13
3.fetal alcohol syndrome
4.Cri du chat