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pogonyaev
2 years ago
8

Why is evolution considered a theory and not a law

Biology
1 answer:
cluponka [151]2 years ago
3 0
Theories explain phenomena, whilst laws are generalizations which characterize them.
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Burning of fossil fuels has changed the atmosphere by
Ad libitum [116K]
I guess it is increasing concentration of carbon
producing a hole on ozone is because of the Freon in air conditioners and i guess all the others are wrong <span />
6 0
3 years ago
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Why is there more creatine kinase in dmd muscles compared to average muscles
Nastasia [14]

Answer:

Explanation:

Almost everyone with a neuromuscular disorder has had, or will have, a creatine kinase test. But what exactly is creatine kinase (CK), and why are its levels measured in neuromuscular diseases?

CK, also known as phosphocreatine kinase, or CPK, is a type of protein called an enzyme. It catalyzes, or "encourages," a biochemical reaction to occur. The normal function of CK in our cells is to add a phosphate group to creatine, turning it into the high-energy molecule phosphocreatine. Phosphocreatine is burned as a quick source of energy by our cells.

However, the normal function of CK isn't as relevant, in this case, as what happens to CK when muscle is damaged. During the process of muscle degeneration, muscle cells break open and their contents find their way into the bloodstream. Because most of the CK in the body normally exists in muscle, a rise in the amount of CK in the blood indicates that muscle damage has occurred, or is occurring.

To measure CK levels, a blood sample is taken and separated into fractions that contain cells and a fraction that doesn't — the serum. The amount of CK in the serum is reported in units (U) of enzyme activity per liter (L) of serum. In a healthy adult, the serum CK level varies with a number of factors (gender, race and activity), but normal range is 22 to 198 U/L (units per liter).

Higher amounts of serum CK can indicate muscle damage due to chronic disease or acute muscle injury. For this reason, if you're scheduled to have blood drawn for a CK test to diagnose a potential muscle disorder, you should limit your exercise to normal activities before the test.

7 0
3 years ago
Explain how a nutrient can be a limiting factor in an ecosystem.
11111nata11111 [884]

Answer: Since nutrients are needed to build life tissues and carry out essential life functions, a limiting nutrient (scarce nutrient) will limit organisms' growth in an ecosystem.

6 0
2 years ago
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Which of the following is not true concerning the layers of the Earth?
MariettaO [177]
(C.) The layers of the Earth are uniform in thickness

This is untrue. The mantle is far large than the crust and there are other large size differences.
7 0
3 years ago
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After 3 half lifes how many c-14 atoms would remain
ipn [44]

Answer:

Halife of C-14 is=14(RAM÷2)

You get=7 but further more let's say after 3 half life as your question stated it may result to decimal something which is impossible (as nucleons never be decimal)

Hence after 3half life it will continue to be 7

6 0
3 years ago
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