Question

mammals grow inside their mothers during the first part of their life cycles. this is called pregnancy. another name for this is the gestation period. julian visits a farm and sees a pregnant cow and a pregnant pig. the farmer tells julian that the gestation period for cows is 279 days, and the gestation period for pigs is 114 days.

1. julian wants to see the baby cow once it is born. what important fact must he know?

a. how long the cow has been pregnant
b. what color the baby cow will be
c. how long the gestation period is
d. both a and c

1. the farmer tells julian that the pig has been pregnant for 100 days. when should he come back to see the baby pigs?

a. 3 months
b. 2 months
c. 1 week
d. 2 weeks

1. what can julian do to investigate which farm animals have the longest and shortest gestation periods?

Explanation:

Question 1

To determine when the baby cow is born, Julian needs to know the gestation period (how long the cow is pregnant) and how long it has already been pregnant. Option a tells how long it's been pregnant, option c tells the total gestation period, so both a and c are needed.

Step1: Find remaining days for pig gestation

The gestation period for pigs is 114 days, and it has been pregnant for 100 days. So remaining days = $114 - 100 = 14$ days.

Step2: Convert days to weeks

Since 1 week has 7 days, $14\div7 = 2$ weeks.

Julian can research the gestation periods of different farm animals (like cows, pigs, sheep, chickens - though chickens are not mammals, but for farm animals in general) from reliable sources like books on animal science, agricultural websites, or by asking experienced farmers. He can also observe pregnant farm animals and record the time from pregnancy to birth for each to compare.

Answer:

d. both a and c

Question 2