Which of these conditions are always true of populations evolving due to natural selection? Condition 1: The population must vary in traits that are heritable.

Condition 2: Some heritable traits must increase reproductive success.

Condition 3: Individuals pass on most traits that they acquire during their lifetime.

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#Question id: 12148

#Section 1: Ecology

If asked to find the cause of regular fluctuations in a population's size not associated with seasonal environmental variation, you would probably first seek evidence for: 

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#Question id: 10866

#Section 1: Ecology

A form of competition, found in desert shrubs and sponges, in which one organism releases a chemical into the environment that inhibits another, is referred to as

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#Question id: 12314

#Section 1: Ecology

Optimal foraging involves all of the following except

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#Question id: 12126

#Section 4: Behavioural Ecology

Which of the following describes a successional event in which one organism makes the environment more suitable for another organism?

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#Question id: 3486

#Section 4: Behavioural Ecology

Which of the following might affect the foraging behavior of an animal in the context of optimal foraging?

A) risk of predation

B) prey size

C) prey defenses