When a river reaches a lake or the sea the water slows down and loses the power to carry sediment . The sediment is dropped at the mouth of the river. Some rivers drop so much sediment that waves and tides can't carry it all away. It builds up in layers forming a delta.
so Ur answer is Deltas are build up by deposition
We just went over this is my bio class. If you have 2 dominant healthy (non-sickle cell) traits, as in the first case, you are sickle cell free but at risk of malaria. On the contrary, if you have 2 recessive sickle-cell traits, you will have sickle-cell. The heterozygous situation is the trickiest to understand so I’ll go over it pretty slowly. Single the healthy allele is dominant, if you have one dominant and one recessive, you are a carrier and will have somewhat healthy cells. Your red blood cells will be fragile and pop relatively easily. How malaria works is it takes host of your red blood cells. However, with these fragile red blood cells, if malaria tries to take host, they pop. Therefore, you are immune to malaria because it cannot take goat of your cells, and you are also free of sickle-cell disease because it is a recessive trait. Comment if you would like me to explain this any further (:
Pollen <span>from a yellow daisy travels across a stream and pollinates an orange daisy.
Gene FLOW - genes inside a pollen travel to the different area and get into separate population. </span>
Answer:
850
Explanation:
rate of population increase = birthrate - death rate + immigration - emigration
= 1400 - 600 + 100 - 50 = 850
Answer:
Action potential in a motor neuron triggers the release of acetylcholine (ACh) neurotransmitter.
Explanation:
Acetylcholine: It is a neurotransmitter released by motor neurons which bind to the receptors end plates of the motor. When an action potential travel down the motor neuron's axon, neurotransmitter release occurs resulting in an influx of calcium and altered permeability of the synaptic terminal membrane.
The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.
In this phase reduction of voltage inside and outside the cell occurs, which is known as depolarization. When ACh binds to the motor end plate this depolarization is known as end plate potential. Then depolarization spread with the sarcolemma and creating an action potential. This action potential moves the entire cell and creating a wave of depolarization.
