Answer:E. Down-regulation
Explanation:Cells typically up or down regulate depending on the concentration of a hormone levels. When there is a excessive concentration of a hormone in the blood stream, the cell decreases the number of receptors reducing the interaction with that hormone, Also, when there is excessive hormone reduction, the target cells activate to increase their number of receptors.
Down regulation occurs by the the deactivating or degrading of target cells to reduce the number of receptors due to their sensitivity to a particular excess hormone.
D. Salamander is not a reptile.
It is an amphibian. It looks like a lizard but is not one. It lives on both land and water.
It's Kingdom Animalia; Phylum Chordata; Class Amphibia; Order Urodela with sub-orders Cryptobranchoidea, Salamandroidea, and Sirenoidea
You know it girl!!
I am not sure but maybe very much because without agrciulture we are doomed to a land without basic neccesities
Answer:
Due to difference in the values of electronegativities.
Explanation:
A covalent bond is formed between hydrogen atom with a partial positive charge on it and another atom, such as oxygen, have a partial negative charge on an adjacent molecule. This is because of the difference in the values of electronegativities. The hydrogen atom has lower electronegativity value as compared to oxygen so the shared pair of electron is slightly attracted by oxygen atom towards itself and formed partial positive charge on hydrogen and partial negative charge on oxygen atom.
