Answer:
There are many different ways that cells can connect to each other. The three main ways for cells to connect with each other are: gap junctions, tight junctions, and desmosomes.
Explanation:
Cell Signaling is an important facet of biological life. It allows cells to perceive and respond to the extracellular environment allowing development, growth, immunity, etc. Additionally, errors in cell signaling may result in cancer growth, diabetes.
This is because HIV weakens the immune system and so the body becomes more susceptible to infections or illnesses
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The difference between them is that an ecosystem is a community of organisms and their environment. And a biosphere is all the living organisms.