Answer:
The answer is A.
Explanation:
A and C have parts that are not directly said by the atricle. D mentions that it says double, which is not directly related to it too. A is something we can determine is true based on the relationship we know between the ocean and fish.
Answer:
Explanation:
(AZT) was the first antiretroviral drug used in HIV and AIDS. It is expensive and has several adverse effects including nausea, vomiting, blood problems and myopathy. The review of trials found that AZT does delay the early progression of HIV disease, but this improvement is not sustained. AZT alone does not increase survival for people without AIDS.
It was used by Hubble to measure velocities of galaxies
Explanation:
Carbon has four electrons in its outer most orbit and it can share four more electrons from other atom to complete its valency while oxygen has 6 electrons in its outermost orbit and it can either charge the electron or gain two electrons from other atom.
Therefore in
, the carbon atom shares its two electrons with two electrons of each oxygen atom and forms double bond with it. Thus, total pairs of electron to be shared by the atom of the molecule is two.