Assuming this is multiple choice, the answer would be "niche". An organism's niche is where that certain organism fits into an ecosystem, or what their part to play is.
Answer:
Lipid insoluble hormones/Peptide hormones
Explanation:
Hormones produce their effect by binding to speific receptor. These receptors may be intracellular or membranal.
Membrane receptors;
The lipid insoluble hormones cannot cross the plasma membrane thus their receptors are found on plasma membrane. These are usually peptide hormones.
Examples; Insulin.
Intracellular receptors;
The lipid soluble hormones can cross the plasma membrane thus their receptors are found in cytoplasm. These are usually steroidal hormones.
Example; Testosterone.
Answer:
When a muscle contracts, the actin is pulled along myosin toward the center of the sarcomere until the actin and myosin filaments are completely overlapped.
Explanation:
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Polar ice cap
Explanation:
The polar ice cap is an area on the earth that extends from 66.5° north and south of the equator to the poles.
The polar ice cap is an area of very low temperature and the surface is mostly covered by ice.
- The vast polar ice caps the earth's northern and southern limits.
- This is the region of the Arctic and Antarctic circle.
- This region receives diffused solar radiation from the sun.
- This is why they rarely warm up.
- The region of the equator has no ice because they receive direct sunlight.
- The soil here is frozen.
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