I'm sorry its A..I didn't read it correctly...
Answer:
4. Variations that help with survival will be passed on to future generations and will rapidly change the whole population.
Explanation:
Variations that help with survival MAY be passed on to future generations, depending on how much pressure that variation relieves. Change may not be rapid, depending on how fecund the species is. Also, it will not change the whole population, only future offspring. The current offspring won't all have the new variation.
Answer:
estrogen
Explanation:
Birth control pills contain synthetic hormones which are naturally produced by females. These pills are used to prevent ovulation by maintaining a level hormone balance, so no egg is released. Combination pills contain estrogen and progestin, while progestin-only pills (also known as the minipill) don't contain estrogen. Progestins are synthetic hormones that act to mimic the naturally occurring hormone progesterone. Progestin-only pills are recommended in women who cannot take estrogen.
