Answer:
Water is least dense at 0°C (freezing point)
Atom is the basic element of all living things because it's small. It is the smallest constituent unit of matter which has the properties of a chemical element. They are very small. Sizes are about 100 or 100, 000 fm. They are unstable. They are composed of a nucleus and electrons.
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The limiting factors of an ecosystem are Habitat, Space, Resource abundance, or the reproductions<span />
