Answer: Option D: Neuromuscular junction
Explanation:
This is the site of transmission of chemical signal also known as a chemical synapse between a neuron and a muscle fibre. Most of the time the chemical released which is a neurotransmitter is acetylcholine. When released, it stimulates the release of calcuim ions present in the sarcoplasm: an endoplasm like structure in the muscle fiber that contains calcium ions.
Both answers are A. If not im sorry
New, more adaptable species flourish, replacing the extinct species.
The selection pressures before the extinction tend to favor a certain type of organism and the sudden shift in conditions help others move up the food chain.
It is the ratio of a line segment cut into two pieces of different lengths such that the ratio of the whole segment to that of the longer segment is equal to the ratio of the longer segment to the shorter segment.
Let me explain something that can make you easily understand ok?
So as you know, humans has 46 chromosomes right?
Also, you know that when a gamete is formed there are 2 cell infused to form that 46 chromosomes. (The human cell and sperm)
IF the cells has 46 chromosomes each and it infused with another 46 chromosomes then the total will be 92 chromosomes and not 46 chromosomes. That's why the cell produced only has 23 chromosomes which is fewer so that when it form a genetic material, the total chromosomes will be 46 chromosomes.
Sorry if my english sucks, hope you understand REEEEE
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