Answer:
an Abiotic Factor
Explanation:
The non-living components of the environment are known as abiotic factors. Abiotic factors include things such as rocks,water,soil,light,rocks etc...
I think your right thats what i think it is two
The wall of the heart<span> consists of three </span>layers<span>: the epicardium (external </span>layer<span>), the myocardium (middle </span>layer<span>) and the endocardium (inner </span>layer<span>). The epicardium is the thin, transparent </span>outer layer<span> of the wall and is composed of delicate connective tissue.
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<span>Formation of bivalents lead to spindle fibers from opposite poles attaching to homologous chromosomes.
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The systems affected when someone does not take their seasonal allergy medication are the muscular system, immune system, circulatory system, and the respiratory system. Therefore, all of them are correct.