Answer:
H2O (Water)
Explanation:
Oxygen (O2) is the final acceptor molecule after the process of aerobic respiration. Specifically, it accepts hydrogen ions at the end of the electron transport chain, the main energy-generating stage of cellular respiration.
This is why oxygen is needed to form large amounts of cellular energy, as without it, the electron transport chain cannot proceed. When oxygen accepts hydrogen ions, it forms water, a byproduct of aerobic respiration.
The entry of the sperm nucleus is facilitated by C) acrosome reaction. The acrosome is the head-like structure at the front of the sperm cell. This contains digestive enzymes that break down the outer membrane of the egg cell, allowing the nucleus of the sperm cell to enter and fuse with the nucleus of the egg cell.
I think the Ocean has more Carbon dioxide because the atmosphere has a lot of layers. People have died while climbing the Mount Everest cause of how high they go into the atmosphere the less air there is.
In response to a decrease in the concentration of blood <u>oxygen</u>, the kidneys secrete <u>erythropoietin</u>.
In the field of biology, erythropoietin can be described as a hormone that helps in the production of red blood cells (RBC). As red blood cells are the sites that carry oxygen in the blood, more red blood cells mean that the concentration of oxygen will increase inside the blood.
Erythropoietin, which is also referred to as haematopoietin, is produced inside the kidneys. The interstitial cells of the kidneys are the main sites for the production of erythropoietin.
Erythropoietin is produced by the kidneys as a kind of response mechanism when there are decreased levels of oxygen inside the blood. When the oxygen level in the blood reaches a normal level, the production of this hormone is lowered by the kidneys.
Although part of your question is missing, you might be referring to this full question:
In response to a decrease in concentration of blood __________, the kidneys secrete __________.
calcium; renin
oxygen; erythropoietin
sodium; aldosterone
potassium; ADH
glucose; insulin
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