Why was the concern over global cooling replaced with a concern over global warming?
a.
The science community needed a cause to frighten the general population.
b.
Steady surface temperature increases were noted between the 1970’s and 90’s.
c.
Air pollution only became a concern in the 1980’s.
d.
Scientists observed severe ocean acidification.

Please select the best answer from the choices provided

A
B
C
D

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

a physical change is being made.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.