Answer:
D. Separate ecosystems can affect each other.
Answer:
Levels of organization in ecology include the population, community, ecosystem, and biosphere. An ecosystem is all the living things in an area interacting with all of the abiotic parts of the environment.
Explanation:
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At first it will be filled with weeds and insects. In about 5 years, a wider variety of plants will be growing there and larger animals will live there. They are there because of the food and shelter. Then in 100 years, there would be more soil (because of decomposing dead organisms). WIth more soil, bigger plants could grow and larger animals could live.
Answer:
D. A positive charge, because of a covalent bond with oxygen
Explanation:
A water molecule contain both hydrogen and oxygen atom. Water is a polar molecule because it has positive electric charge in one of it's poles and negative charge on the other. The hydrogen is positively charged and the oxygen is negatively charged which are bonded by covalent bond. Hydrogen is positively charged because it cannot attract electrons strongly like oxygen which is positively charged. There is unequal sharing of electrons in water molecules and this is why oxygen is slightly negative and hydrogen is slightly positive.
