Bears stop coming to a river ecosystem where they have been eating many fish each day. The fish the bears eat normally eat smaller fish, which eat plants along the river bottom
What happens to the ecosystem?
The larger fish population will drop first and the smaller fish population will grow quickly. The plants will
die off because too many of the smaller fish are eating them
The smaller fish population begins to eat more plants and to grow. The larger fish have more food to
eat so their population is able to grow, too.
The larger fish population explodes at first, and the smaller fish population begins to drop. Eventually
the river runs out of smaller fish so larger fish die out, and the plant population grows.
Both the larger and the smaller fish populations grow quickly but then die out because the plant life is
insufficient for them all to eat

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.