The statement which best explains why carbon is present in so many kinds of molecules is because <u>it can form four covalent bonds.
<em /></u>It isn't rare on Earth, so A is incorrect. It has valence electrons, so C is incorrect. It cannot become an ion, so D is incorrect.<u>
</u>
No , it didn't increase cases of addiction.
The endocrine system uses chemicals
Answer:
1. genotype of female: Bb
a. genotype of male: bb
b. white is dominant
c. female phenotype: white
male phenotype: black