1.
Viruses are not considered living things because they are not cellular and they .

do not have proteins
do not have genetic material
must have host cell to reproduce
can't mutate or change their DNA
2.
HIV wipes out a person’s immune system by attacking what types of cells?

B cells
skin cells
helper T cells
red blood cells
3.
People can have the rhinovirus more than once because .

they have no while blood cells
it hides then re-attacks later
the body can't make antibodies
there are many types of the virus

1: C . Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.

2: C. (Cells At Work! is a great show to watch if you want to learn about the body and how it operates, and to learn about what cells do what.)

3:  D. There are multiple formations of the virus. For every virus, there's more than one type, and they do different or affect the same area and have extremely similar symptoms.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.