Factors that influence where a specific organism can be found include
a. competition with members of their own species.
b. physical factors found in the environment.
c. the age of the organism.
d. the number of female-to-male organisms.
e. the growth rate of the population.
B
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The ripening of fruit and the dropping of leaves and fruit are principally controlled by _____
A) auxins B) cytokinins C) indole acetic acid D) ethylene E) carbon dioxide concentration
After his return to England, Darwin most pondered which question?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockingbirds have a common mainland ancestor? e. Will natural selection work in England?
Which of the following excretory structures is used by birds?
A. nephridia B. cloaca C. urethra D. flame cells
The lac operon of E. coli is ________ when the repressor is bound to ________
A) active; lactose B) inactive; lactose C) active; tryptophan D) inactive; tryptophan