If something in the environment controls a population level and is uninfluenced by the population size, it is known as
A. a biotic factor.
B. a density-dependent limiting factor.
C. a density-independent limiting factor.
D. None of these answers is true.
C. a density-independent limiting factor.
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What is a photosystem?
A. A double-membrane organelle containing thylakoids B. Clusters of pigments and proteins that capture light energy C. Stacks of thylakoids D. A leaf or any green part of the plant
In eukaryotes, the 3' poly-A tail is attached to
A. poly-A polymerase. B. mRNA. C. tRNA. D. the ribosome. E. the template strand of DNA.
Pancreatic secretion of bicarbonate is stimulated by _____.
A. secretin B. gastric inhibitory peptide C. glucagon D. cholecystokinin E. gastrin
What can we learn about evolution from biogeography?
What will be an ideal response?