5 What is true regarding keystone species?
Choose 1
They promote stability in an ecosystem.
B
They decrease biodiversity within an ecosystem.
с
They are non-native species that displaces native organisms.
They always have the largest number of organisms in an environment.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101

you know that this symptom is misleading and quite often is related to: heart attack

a heart attack is a condition that occurs when the blood flow that transports oxygen to the heart muscle is damaged or cut off completely. the coronary arteries that supply the heart muscle with blood flow can be blocked by the accumulation of plaque. also, when the plaque within the heart artery breaks, it creates blood clot that can also hinder the blood flow. men that are over 45years of age and women that are over 55years of age are at risk of having a heart attack. the symptoms of a heart attack include chest discomfort, chest pain, coughing, and shortness of breath.

answer: your large intestine is about five feet (or 1.5 meters) long. the large intestine is much broader than the small intestine and takes a much straighter path through your belly

explanation: the small intestine also is known as small bowel, which is around 20 feet long while large intestine which is also called colon or large bowel, is only 1.5 m long in size. being the part of our digestive system, they differ in their structure as well in their functions too