The cardiovascular system includes the heart. the respiratory system (lungs) supply's oxygen to the heart which, in turn, keeps it beating. the blood carry's the oxygen to all the parts of the body.
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Answer:
X is negative heterotropic modulator
Explanation:
In allosteric regulations, modulators are molecules that causes a change in the conformation of an enzyme, hence, resulting a change in enzyme activity. It can lead to a decrease or an increase of the enzyme. When a molecule decreases the enzyme activity it called a negative modulator, when it increases or activates the enzyme activity, it is called a positive modulator.
A positive or negative modulator can either be homotrophic (substrate acts as modulator) or heterotropic (another ligand acts as modulator).
In the example above, X is negative heterotropic modulator, because the modulator is different from the substrate and it also decreases the enzyme activity.
Grizzy bear's habitat is a physical area where the bear lives. All grizzy bears live in this habitat to survive.
I'm pretty sure the offspring is not likely to express the recessive trait because the homozygous dominant allele usually overcomes any heterozygous recessive trait.