<span>An atom consists of a positively-charged nucleus, consisting of various combinations of protons and neutrons, and negatively-charged electrons which move around the nucleus in distribution patterns called shells. In a neutral atom, the number of electrons is equal to the number of protons, but an ionized atom would have more or fewer electrons. Electrons are much less massive than protons or neutrons.
(2) How are groups of atoms organized?
Atoms bond together with other atoms to form molecules or can be part of a crystal lattice. </span>
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Answer:
B
C
B
B
A
D
A
B
D
c
Explanation:
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Answer:
In addition to protection (physical and chemical barrier), the skin serves other functions which is It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism.
Therefore, the correct answer to the question is option C
Explanation:
Skin is the outer covering of the body. The main function of the skin is protection of internal parts of the body. Rather than this it is the site of absorbing the sunlight for the vitamin D. It is also helpful in the metabolism activities.
Skin also helps in the cooling of the body as it helps in the evaporation of sweat which result in instant cooling of the body in heated up surroundings.
The first step is the parent cell splits into two identical daughter cells by mitosis