A. The study of animal behavior
During the day, plants produce oxygen by splitting water molecules in the light-dependent reactions of photosynthesis.
Light-dependent reactions occur in thylakoid membranes of chloroplasts and begin with the absorption of light energy. This energy (together with water and photosystems) is used for the production of ATP and the reduced electron carrier NADPH which are necessary for the next stage of photosynthesis. Oxygen is released.
At the same time, plants use cellular respiration to produce some of the carbon dioxide needed by the light-independent reactions to make sugars.
Cellular respiration is a chemical reaction of plants where they use glucose and oxygen to produce carbon dioxide and water and release energy.
During the night, plants produce carbon dioxide, but not oxygen because only cellular respiration takes place.
There is no sunlight at night, so only the cellular respiration occurs.
Answer:
C) male-male competition; sexual conflict and antagonistic coevolution
Explanation:
Male-male competition happens when two males of a species fight for the opportunity to mate with a specific female.
Answer:
Option D, aortic valve
Explanation:
The location of aortic valve i.e between the aorta and left ventricle, allows it to stop the blood from flowing back into the left ventricle.
The other options are incorrect as -
Pulmonary valve being located between the pulmonary artery and right ventricle, stop the blood from flowing back into the right ventricle.
The tricuspid valve and mitral valve stops the blood from flowing back into the right atria and left atria respectively.
Hence, option D is correct.
