Virus infect and reproduce by recognizing specific receptors in their host cells. Virus-receptor binding is highly specific, this is the reason why some virus can infect only certain animals or plants at specific tissues. If the virus that causes avian flu attaches only to the cells of the lower part of the respiratory system, it is very likely that these cells have specific receptors that are not present in the upper part of the respiratory system, receptors that the viruses recognize.

7 0

3 years ago

By what process did egg cell and sperm cell form

lesya692 [45]

when a sperm cell and an egg cell fuse they form a diploid cell known as zygote

5 0

3 years ago

The image illustrate a human induced environmental change image best illustrates which change

stealth61 [152]

Answer:

The image illustrates the human-induced environmental change related to wildlife hazard .

Explanation:

Options for this question are:

Pollution .
Wildlife hazard .
Eutrophication .
Non-sustainable harvesting.

Human-induced changes in the environment are all those actions that are consciously carried out and that affect the normal development of natural life or ecosystems. Many of these changes are negative and put wildlife at risk.

In the image you can see a bear on a stretch of road, probably built near of its natural habitat. Constructions in natural areas clearly affect nature and the wildlife present there, representing a danger to the wild species present there and even to humans.

5 0

4 years ago

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