The corpus luteum will
a. degenerate into a corpus albicans if fertilization does not occur.
b. remain active if fertilization occurs.
c. produce luteinizing hormone to stimulate the uterus to enter the secretory phase.
d. a& b
e. a, b, & c

Option (D).

Explanation:

Corpus luteum is a cluster of cell mass present in the ovary. Corpus luteum release hormones and play an important role in the female reproductive system.

Corpus luteum is degenerated into the corpus albicans if the egg is not fertilized by the sperm. During early pregnancy, corpus luteum releases the hormone progesterone. After 10 weeks of pregnancy corpus luteum starts decreasing in size.

Thus, the correct answer is option (D).

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

what bodys are there orbiting?