Explain how natural selection les to flu illnesses inpatients even though they received the flu shot

The natural selection that takes place does not happen in humans - it happens in the virus itself. When a patient has been vaccinated against the flu, they build up the antibodies to a particular strain of the flu virus.

Since the patient has these antibodies, the virus is unable to get into the patient's cells, and they cannot reproduce. However, if there is a mutation in the virus, or there is a strain that the patient has not been vaccinated against, they can then invade the patient's cells - allowing them to reproduce and cause illness in that patient.

So the virus that is unable to reproduce is then losing the 'natural selection' battle against either the mutated virus or a new strain that has become present.

homeostasis is the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. and this is how it applies to the integumentary system. back to top. skin functions in homeostasis include protection, regulation of body temperature, sensory reception, water balance, synthesis of vitamins and hormones, and absorption of materials. when body temperature falls, the sweat glands constrict and sweat production decreases.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

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