In mammals, the strongest males hold large territories and therefore ____
a. control a lek
b. exhibit sexual dimorphism
c. share parenting duties
d. are monogamous
e. mate with all the females inside the area
e
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On a short-term basis, water loss in plants may be controlled by the
A. opening of the stomata in the leaves to allow more carbon dioxide to enter. B. closing of the stele in the roots. C. bending of the petioles on the leaves. D. opening the Casparian strips in the roots. E. closing of the stomata in the leaves to limit transpiration.
Phospholipids have hydrophilic tail regions and hydrophobic head regions
Indicate whether the statement is true or false
When auxin accumulates on the lower side of the root of a germinating seed, it
A) has no effect on the root; it affects only the developing shoot. B) increases the use of energy by the cells in the root. C) decreases the use of energy by the cells in the root. D) increases cell elongation on the lower side of the root E) decreases cell elongation on the lower side of the root.
Suppose that in a population you are studying you find the sex ratio is different from what you predicted in your model
Using simple proportions of male and female offspring, show how over a few generations, natural selection should move the sex ratio to the value you predicted in your model. What will be an ideal response?