What is the age of a fossil that contains one-fourth of the amount of carbon-14 found in living organisms? Use the image below as a reference.

A.
22,920 years
B.
2865 years
C.
11,460 years
D.
5730 years

C. 11460 years

Explanation:

the halflife of C-14 is 5730 and since there is 1/4 left that means it went through 2 halflife periods

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

this was from the link provided:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.