Answer:
O negative blood
Explanation:
For emergency transfusions, blood group type O negative blood is the variety of blood that has the lowest risk of causing serious reactions for most people who receive it. Because of this, it's sometimes called the universal blood donor type.
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16 (8 protons + 8 neutrons
Answer:
<h2>On average, only about 10% of the energy stored as biomass in one trophic level—e.g., primary producers—gets stored as biomass in the next trophic level—e.g., primary consumers. Put another way, net productivity usually drops by a factor of ten from one trophic level to the next.</h2>
Answer:
Electrical stimulation of the cell is depolarization, and electrical relaxation of cells is repolarization.
Explanation:
The electrical activity of the cell depends on the charges distributed on each side of its membrane, which depends on the presence of ions on each side, extracellular sodium and intracellular potassium.
A cell, like the neuron, at rest has a tendency to be negatively charged in its cytoplasm, while the extracellular space has a positive charge.
- Depolarization of a cell occurs by opening the sodium channels, allowing this ion to enter the cell, resulting in a difference in transmembrane potential. It is electrical stimulation of the cell.
- If the potential difference is maintained and reaches the umbral level, it produces an action potential, which in cells such as the neuron produces an electrical stimulus and in the muscle cell a contraction.
- Repolarization means the opening of potassium channels, the exit of this ion to the extracellular space and the return of the cell to rest.
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brainly.com/question/4661368
The answer is b. Prop roots.
Mangroves are small trees and shrubs that live in the coastal zone. Mangrove trees must fight rough tides, huge waves, strong winds, and storms. One of adaptation is prop roots. The prop roots grow out the mangrove trunk, branches or other prop roots until they touch the ground. There they develop an underground root system. These roots serve as a support in the conditions characteristic for mangrove.
