Vaccines help develop immunity by imitating an infection. This type of infection, however, does not cause illness, but it does cause the immune system to produce T-lymphocytes and antibodies. Sometimes, after getting a vaccine, the imitation infection can cause minor symptoms, such as fever. Such minor symptoms are normal and should be expected as the body builds immunity.
Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
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Answer:
Synthesis of ATP by ATP synthase does not occurs in the absence of oxygen because oxygen is responsible for the transportation of electrons to the cell from electron transport molecules. This electron is used for the production of ATP. If oxygen is not present during ATP production, electrons will not formed in the system. That's why oxygen is very necessary for ATP production.
Answer:
D. the natural resources available in an ecosystem.
Explanation:
Carrying capacity can be defined as a species' average population size in a particular habitat. The species population size is limited by environmental factors like adequate food, shelter, water, and mates. If these needs are not met, the population will decrease until the resource rebounds.
