The right answer is B.
*Hydrogen is the most abundant element representing nearly three quarters of the mass of the universe.
*Hydrogen is found in the water that covers 70% of the surface of our planet as well as in all organic matter.
*Hydrogen is the simplest element in the universe. It is composed only of one proton (p) and only one electron (e-).
*Hydrogen is the lightest element of all elements and gases; it is 14 times lighter than air. A "spill" of hydrogen gas immediately diffuses into the air and pollutes neither the ground nor the water table.
*Hydrogen is invisible, odorless and nontoxic. It does not cause acid rain, does not deplete the ozone layer and does not generate dangerous emissions.
The process by which forms of life having traits that betterenable them to adapt to specificenvironmental pressures, as predators, changes in climate, or competition for food or mates,will tend to survive andreproduce in greater numbersthan others of their kind, thusensuring the perpetuation of those favorable traits in succeeding generations.
Answer:
B.Shelter
Explanation:
Density is defined as mass, Shelter is the only thing that did not contain mass
Por que se ele esta filtrando as bactérias ele precisa ser limpo das bacterias e um acao de higiene