The heritable variation among members of a population comes about because of environment.
The correct answer is valve vegetations and stenosis.
Rheumatic heart disease (RHD) is damage to one or more heart valves that is caused by an episode/episodes of acute rheumatic fever. The normal blood flow through damaged valves is interrupted. The heart valves are unable to function properly, so the blood may flow backward through stretched valves (not closed properly), or may be blocked due to scarred valves (not opened properly). Heart surgery may be required for this condition.
Diffusion is defined as the movement of particles from higher concentration area to lower concentration areas. It continues until the concentration of substances is uniform throughout.
So, the best possible answer to this question is option A - when you inhale oxygen into your lungs,it is sent through your bloodstream to the rest of your body.
Answer:
Geological, chemical, paleontological.
Explanation:
Geological evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics.
Successive glaciations tend to distort and erase the geological evidence, making it difficult to interpret.
It took some time for the current theory to be worked out.
There have been at least four major ice ages in the Earth's past.
Paleontological by their bones, remains