Answer:
If the Universe holds enough matter, including dark matter, the combined gravitational attraction of everything will gradually halt this expansion and precipitate the ultimate collapse. Over time, galaxies, then individual stars, will smash into each other more frequently, killing off any life on nearby planets.
Explanation:
Answer:
While pathogenic bacteria are notorious for such diseases as cholera, tuberculosis, and gonorrhea, such disease-causing species are a comparatively tiny fraction of the bacteria as a whole. Bacteria are so widespread that it is possible only to make the most general statements about their life history and ecology.
Explanation:
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Explanation:
Organisms form species if they live together and can reproduce offspring. A group of organisms of the same species living in the same place at the same time is called a population. If we put populations of different species together, that's called a community. So, a community needs groups of different species to exist.
