It would be C because hair and feathers and what not are made from the protein keratin.
Atom molecule.
Organelle, Cell, tissue, organ, system, organism, population, community, ecosystem, biome.
I think.
<h2>Biotic and Abiotic Factors Controls Viral Activity in Sea </h2>
Firstly, biotic are living components and abiotic are non living. Abiotic are the temperatures of ore and other items that are non-living. In the stream, the biotic factor can be small toads, shrubs, fish anything existing in the sea. In the sea, the biotic factors are any great fish or sea beings existing in that region including the any tiny bodies. In this way, all factors and components control viral activity in the sea.
In the female reproductive tract, fertilization normally occurs in the follicular tube