HELLO EVERYONE Which statement is correct?

A. The number of electrons of a neutral atom always equals the number of protons.
B. Atomic weight is identical to atomic mass.
C. The number of neutrons always equals the number of protons.
D. The number of neutrons always equals the number of electrons.

A. The number of electrons of a neutral atom always equals the number of protons.

Explanation:

For Example

Sodium (Na)

Atomic Number = 11

number of protons and electrons = 11

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.