Answer:
Immune system disorders cause abnormally low activity or over activity of the immune system. In cases of immune system overactivity, the body attacks and damages its own tissues (autoimmune diseases). Immune deficiency diseases decrease the body's ability to fight invaders, causing vulnerability to infections.
Enzymes affect a chemical reaction, making it easier to occur by reducing the activation energy; <u>option B</u>
<h3>What are enzymes?</h3>
Enzymes are biological molecules that alter the rate of chemical reactions occurring in the body.
Enzymes usually speed up the rate of reactions by making the reactions less energy-demanding, that is by lowering the activation energy of the biochemical reaction.
Enzymes are usually proteins, hence are affected by the conditions of temperature and pH.
Enzymes are also very specific in the substrate they act upon.
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In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
Answer:
Gravity is the force of attraction between two objects, and Earth's gravity pulls matter downward, toward its center. It pulls precipitation down from clouds and pulls water downhill. The warm water near the surface of the ocean heats up with sunlight and evaporates, keeping the water cycle in motion.
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