Author Question: Seth and Zack are twin brothers; Seth is tall with blue eyes and brown hair and Zack is short with ... (Read 373 times)

jilianpiloj · **on:** Jun 18, 2018

Seth and Zack are twin brothers; Seth is tall with blue eyes and brown hair and Zack is short with brown eyes and red hair. How were they most likely conceived?

a. One sperm fertilized one egg, which then split into two, early on in development.
b. Two sperm fertilized one egg, which split into two, early on in development.
c. One sperm fertilized two separate eggs.
d. Two sperm fertilized two separate eggs.

Question 2

What is a typical change that occurs in the circulatory system during pregnancy?

a. A woman's blood volume decreases up to 50.
b. A woman's blood volume increases up to 50.
c. The speed of blood flow decreases up to 50.
d. The speed of blood flow increases up to 50.