According to cell theory, what do these four organisms have in common? A) They are made of one or more cells. B) They must undergo sexual reproduction. C) They have a nucleus or control center. D) They require carbon dioxide to produce food.

A) They are made of one or more cells

Explanation:

Cell theory states that:

1. All organisms are composed of one or more cells, and the life processes of metabolism and hereditary occur within these cells

2. Cells are the smallest living things, the basic unit of organisation of all organisms

3. New cells arise only by division of pre-existing cells

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8