__________ refers to nutrient enrichment of any ecosystem that is otherwise low in nutrients. Fill in the blank(s) with the appropriate word(s)
Eutrophication
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In Belding's ground squirrels, it is mostly the females that behave altruistically by sounding alarm calls. What is the likely reason for this distinction?
A) Males have smaller vocal cords and are less likely to make sounds. B) Females invest more in foraging and food stores, so they are more defensive. C) Females settle in the area in which they were born, so the alarm is more likely to warn kin. D) The sex ratio is biased. E) Males forage in areas separate from females; therefore, alarm calls are useless.
X inactivation occurs
a. at birth. b. at the beginning of the second trimester. c. after the first cleavages of the zygote. d. at the moment of conception. e. randomly depending on the individual.
Which statement regarding the scientific method is false?
A) Original hypotheses are formed after an experiment. B) Experiments need to be repeatable. C) Inductive reasoning is used to form a hypothesis. D) The control and experimental group are identical except for one variable. E) Observations are used to form a hypothesis.
Describe the natural defenses of the skin that prevent many infections of this area
What will be an ideal response?