What is an ecosystem? 1 . All of the environments and all of the communities on the planet

2. The populations of all species and all abiotic factors within a geographical area.

3 .All of the individual organisms belonging to the same species within a geographical area

4. The populations of all species within a geographical area

5. All abiotic factors within a geographical area

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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idk i'm not smart

explanation:

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the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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