Answer:
Epithelial tissue
Explanation:
Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. Epithelial layers contain no blood vessels, so they must receive nourishment via and diffusion of substances from the underlying connective tissue, through the basement membrane.
The chemistry shorthand for water is H₂O .
Right there, it's telling you that a molecule of water is the combination of two Hydrogen atoms bound to one Oxygen atom.
Answer:
plants animals and cosmic rays
It's harder to find one of the many genes involved in a polygenic trait vs the only gene involved in a discrete trait.
