A should be the correct answer because any argument based on science makes a result more logical.
Answer:
protons and neutrons
Explanation:
protons and neutrons is equal to mass number
Answer: The mass density is 1166.36
.
Explanation:
Given: Weight of sample in air
= 500 N
Weight of sample in alcohol
= 200 N
Specific gravity = 0.7 = 
Formula used to calculate Buoyant force is as follows.

Hence, volume of the material is calculated as follows.

where,
= Buoyant force
= specific gravity
g = acceleration due to gravity = 9.81
Substitute the values into above formula.

Now, mass of the material is calculated as follows.

Therefore, density of the material or mass density is as follows.

Thus, we can conclude that the mass density is 1166.36
.
Answer:
what kind of home work u dogeing
Explanation:
hydrogen (H2),and oxygen (O2),, that is the answer