6.3

Question 1

host

Answer 1

individual that is disadvantaged by parasitism.

Question 2

mutualism

Answer 2

symbiosis in which both species benefit from the relationship.

Question 3

pairing (to form pairs)

Answer 3

cooperation between a male and a female to reproduce.

Question 4

hierarchy

Answer 4

a relationship within a population in which one animal is dominant and the other know their place.

Question 5

biological equilibrium

Answer 5

fluctuating balance of population sizes in an ecosystem.

Question 6

population size

Answer 6

the number of organisms in a population.

Question 7

territory

Answer 7

area that is defended against others of the same species.

Question 8

parasitism

Answer 8

symbiosis in which one individual benefits from the relationship and the other individual is disadvantaged.

Question 9

cooperation

Answer 9

a relationship involving working together.

Question 10

parasite

Answer 10

individual that benefits from parasitism.

Question 11

symbiosis

Answer 11

long-term relationship between individuals of different species.

Question 12

commensalism

Answer 12

symbiosis in which one individual benefits from the relationship and the other individual neither benefits nor suffers.