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You are doing a mark-recapture experiment to determine the population size of the MendAliens living on an island in my back yard. Initially, you catch and mark 130 MendAliens, which you then release. Next, you capture 90 MendAliens, of which 20 are marked. What is your estimate of the population size of MendAliens living on the island in my back yard?

585
[ To get the population size N, multiply the number marked in the first catch, M1, by the total number caught in the second catch, C, and divide that by the number of marked recaptures in the second catch, M2: "N = (M1 x C) / M2" Or: (130 x 90) / 20 = 585 ]

Assume there are 200 MendAliens living on an island in my back yard. If my island has an area of 20 hectares, what is the population density of MendAliens in terms of MendAliens per hectare?

10 MendAliens per hectare

The mark-recapture method would be best for sampling a population of _____.

sharks

Which of these species typically has a mortality rate that remains fairly constant over an individual's life span?

robins

Oyster populations are primarily, if not exclusively, composed of _____.

adults

Which of these organisms has a survivorship curve similar to that of oysters?

grasses

Which of these organisms has a survivorship curve similar to that of humans?

elephants

At current rates of growth, the current human population size is expected to double in about _____ years.

40

Which of these was the first of the major events that stimulated an increase in the size of the human population?

the advent of agriculture

Which of these was the second of the major events that stimulated an increase in the size of the human population?

the Industrial Revolution

Which of these was the third of the major events that stimulated an increase in the size of the human population?

the discovery of vaccines and the discovery of antibiotics

Currently, how large is the worldwide population of humans relative to Earth's carrying capacity for humans?

there is insufficient information to answer this question

Ignoring migration, the age structure of a human population likely to increase in size will have what shape?

pyramid
(This would mean that most individuals are in the prereproductive years. Such a population is expected to increase. )

Ignoring migration, the age structure of a human population likely to decrease in size will have what shape?

inverted pyramid
( In such a population the majority of individuals are in their postreproductive years. Such a population is expected to decrease.)

Ignoring migration, the age structure diagram of a human population likely to maintain a relatively stable size will have what shape?

a rectangle tapering toward the top
( Such a population is expected to have a relatively stable size.)

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