A.   All of these statements are correct

B.   Food availability

C.   The number of males who are available for mating

D.   The number of gametes females can produce

A.   All of these statements are correct

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

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

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

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

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

C.   Allomaternal care is more likely

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

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

C.   Both of these responses are correct

A.   How long a monogamous pair bond lasts

B.   Tail length

C.   Reproductive success

A.   In species that have enduring pair bonds

B.   In one-male/multi-female groups

C.   False; males never invest in offspring

A.   In multi-male/multi-female groups

B.   In one-male/multi-female groups

C.   In polyandrous groups

A.   Humans are present

B.   Variation in reproductive success is the highest for males

C.   Monogamy is common

A.   All of these statements are correct

B.   Temporary

C.   Ends when offspring are weaned

D.   Occurs because nursing requires an enormous amount of calories

A.   During the rainy season

B.   When a new female enters a group

C.   When a male increases in rank