Imagine That in One Portion of Their Range, Black Widowbird

question 1

Multiple Choice

Imagine that in one portion of their range, black widowbird numbers are declining due to the introduction of a non-native snake that eats their eggs and nestlings. Prior to mating, a male widowbird produces sperm cells through the process of __________. When the sperm fuses with an egg cell, __________ has occurred.

• A) meiosis; fertilization
• B) fertilization; meiosis
• C) sexual selection; meiosis
• D) fertilization; mutation

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Definitions:

Marginal Cost

The investment required to manufacture an additional unit of a product or service.

Nonrivalry

The idea that one person’s benefit from a certain good does not reduce the benefit available to others; a characteristic of a public good.

Nonexcludability

The inability to keep nonpayers (free riders) from obtaining benefits from a certain good; a characteristic of a public good.

Public Goods

Goods that are non-excludable and non-rivalrous, meaning their use by one person does not reduce availability to others.