The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
A gene<span> is a stretch of DNA or RNA that determines a certain trait. </span>Genes<span> mutate and can take two or more alternative forms; an </span>allele<span> is one of these forms of a </span>gene<span>.</span>
Receptor receives chemical signals came from the cell's outside environment. It is made up of protein molecule. The correct answer for the question above is letter a. Receptor protein allows one or <span>a few specific molecules to pass across the membrane.</span>
This is called translation because you are translating the code from the mRNA into amino acid language.
Answer: D- Animal respiration and decomposition.
Explanation:
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