Answer:
answer is b
it allows specific substances to cross through it
There are choices for this question, namely:
<span>chemical name
generic name
brand name
research name
</span>
The correct answer is "brand name". The brand name is the name of the drug that is tied to the specific manufacturer. The generic name of the drug is the approved name of the drug which corresponds to its drug class and specific mode of actions. The chemical name, as the name suggests, comprise of the detailed chemical makeup of the drug.
Answer: Option E) polar
Amino acid-derived and peptide hormones are unable to diffuse across a cell membrane because they are polar
Explanation:
Amino acid-derived and peptide hormones such as serotonin, epinephrine, dopamine etc, are unable to diffuse across a cell membrane because they consist of several repeating units of amino acids with positively charged or negatively charged side chains.
Thus, the side chains make these hormones water-loving (hydrophilic), and impassable to the hydrophobic layer of the cell membrane.
Starfish reproduce asexually by fission.
Answer: Individuals make up a population; populations make up a species; multiple species and their interactions make up a community; and multiple species and their interactions make up ecosystems when you include the abiotic factors. This is the hierarchy of ecology.
hope this help
Explanation: