The Developing ovarian follicles primarily secrete hormone Estrogen.
Ovarian follicles are the basic units of female reproductive system. Estrogen, in females, are produced primarily by the ovaries, and during pregnancy, the placenta. Follicle-stimulating hormone stimulates the ovarian production of estrogens by the granulosa cells of the ovarian follicles and corpura lutea.
The importance of space rovers is that they help researchers on other planets for example samples of dust, rocks, pictures (basically get information). Some rovers can also transport members of a spaceflight crew.<span />
"Vessels, heart, circulating fluid" are the three components among the following choices given in the question that <span>are common to the circulatory systems of most living animals. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has helped you.</span>
Answer:
The correct option is A) ATP
Explanation:
Some ions or molecules tend to move in the cell along a concentration gradient. Such types of movement is known as passive transport. In passive transport, molecules move from a higher concentration to a lower concentration. Such kind of movement doesn't require energy.
Other kinds of molecules or ions move against the concentration gradient i.e from a lower concentration to a higher concentration. Energy is required for these process to occur.The energy used is in the form of ATP.