Natural selection only acts on the population’s heritable traits: selecting for beneficial alleles and thus increasing their frequency in the population while selecting against deleterious alleles and thereby decreasing their frequency
I think the best answer for the question your asking is A; the reason why is because with constricted blood vessels and increased blood volume that's your best way to have increased blood pressure.
The answer would be A. When supply exceeds demand
This is because there is plenty supply for the forest without animals dying from things such as, lack of food.
When demand exceeds supply it throws an ecosystem off because some animals aren't getting the food they need and therefor dying. So that eliminates answers C. and D.
When supply and demand are both 0 that means that there are no animals to demand and there are no supplies for demand leaving no sustainable ecosystem.
<span>The pancreas is an accessory organ of the digestive system (alimentary canal includes the mouth, pharynx, esophagus, stomach, small intestine, large intestine, and anus). The pancreas is a glandular organ which produces glucagon, somatostatin, and pancreatic polypeptide and also digestive organ because it secreting pancreatic juice and digestive enzymes that assist digestion and absorption of nutrients in the small intestine.</span>
Answer: Animals have exceptions like Sponges and Corals. ... Reproduction of plants takes place asexually like by budding, vegetative methods, spores, wind, or through insects, whereas some lower animals like algae reproduce asexually while higher animals reproduce sexually and give birth to the young one.
Explanation: