A.   All of these statements are correct

B.   The number of males who are available for mating

C.   Food availability

D.   The number of gametes females can produce

A.   All of these statements are correct

B.   Gaining more access to resources by being successful in competition with other females

C.   Gaining more access to resources by cooperating with other females

D.   Finding the optimal amount of care to invest in offspring

A.   The more females invest in the care of their offspring, the less time and resources they have to devote to future offspring

B.   Allomaternal care is more likely

C.   Males invest more in care of offspring than females do

A.   favors traits that make individuals more successful in competition for access to mates

B.   Both of these responses are correct

C.   favors traits that make individuals more attractive to the opposite sex

A.   How long a monogamous pair bond lasts

B.   Reproductive success

C.   Tail length

A.   False; males never invest in offspring

B.   In species that have enduring pair bonds

C.   In one-male/multi-female groups

A.   In multi-male/multi-female groups

B.   In polyandrous groups

C.   In one-male/multi-female groups

A.   Monogamy is common

B.   Variation in reproductive success is the highest for males

C.   Humans are present

A.   Occurs because nursing requires an enormous amount of calories

B.   Ends when offspring are weaned

C.   Temporary

D.   All of these statements are correct

A.   During the rainy season

B.   When a new female enters a group

C.   When a male increases in rank