Answer:
a.
Explanation:
Engery is the driving force of the oxygen cycle is photosynthesis itself, which is responsible for the creation and maintenance of earth's atmosphere.
Answer:
D
Explanation:
How does energy control the loss of water to a hypertonic enviorment to avoid dehydration?
After two half-lives or 60 years, 7.5 g of the element will be left.
<u>Explanation:</u>
<u>Half-life:</u>
- In simple words, Half-life can be defined as the amount of time needed for a quantity to fall to half its value as contained at the beginning of the time period.
- In this problem the half-life of the element is thirty years, then after thirty years half of the sample would have decayed and half would be left as it is.
- After thirty years (The first half-life ) 30 /2 = 15 g declines and 15 g remains disappeared.
- And after another sixty years (The two half-lives) 15 /2 = 7.5 g declines and 7.5 g remains disappeared.
- After two half-lives or 60 years, 7.5 g of the element will be left.
Answer: The correct answer would be 112.5 pounds
Explanation:
Let us first covert the pound into grams. We know that 1 pound is equal to 453.59 grams.
Thus, 50 pound of fat = 50 x 453.59 = 22,679.5 grams.
We know that, 1 gram of fat releases 9 Kcal of energy. Thus, total energy produced by 22679.5 grams = 9 x 22679.5 = 204,115.5 Kcal
Glycogen is carbohydrate thus, it will produce 4 Kcal of energy per gram.
Thus, 4 x C = 204,115.5 (where C is the grams of glycogen)
⇒ C = 
⇒ C = 51,028.875 grams
Using 1 pound = 453.59 grams, we con convert 51,028.875 grams into pounds:
453.59 = 1
1 = 
51,028.875 = 
= 112.5 pounds
Thus, 112.5 pound of glycogen would be needed to produce the same amount of energy as produced by 50 pounds of fat.

Absolute Dating
AKA. RADIOMETRIC DATING
We can learn about the past by studying the present.
The Principle of Uniformitarianism states that current geological processes are the same processes that were at work in the past. This principle was proposed by Charles Lyell in the 1800's
Absolute Dating
Involves finding the absolute age (actual age) of a rock or fossil.
Elements that emit particles and energy are radioactive.
As radioactive elements emit particles and energy, they form new isotopes or elements.