Answer:
B) Under a microscope he observed box-like compartments of cork tree bark.
He observed a cork under a microscope.
Explanation:
He observed a cork under a microscope.
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<span>simple organic molecules can form spontaneously under conditions like those thought to prevail early in Earth's history</span>
Nitrogen fixation is the process where atmospheric nitrogen is converted by bacteria into biologically usable forms.
plant can not take nitrogen directly from the leaves.
Answer:
A bottom-up system concentrates attention on how resources (space and nutrients) influence higher trophic forms , whereas a top-down system focuses on interactions at top level consumers (predators) and their prey influence on lower trophic forms.
Explanation:
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