Which of the following is true about scientific theories? I. New research is often done to learn more about existing scientific theories. II. Scientific theories can be revised, changed, or even rejected. III. Scientific theories are considered to be facts and cannot ever be modified. IV. New scientific theories can be formed to explain new phenomena.

Answers

Answer 1

Answer: scientific theories can be revised, changed, or even rejected.

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Which of the following statements concerning Francisella is false?A. An attenuated vaccine is used for high-risk individuals B. It resists phagocytosisC. Humans are its only known hostD. It is extremely infectiousE. It cannot be treated with penicillins or cephalosporins
Dr. Evil administers a toxin that disrupts ribosomal RNA (rRNA) synthesis in the cell above. Which labeled structure would be most negatively impacted by this toxin? 1) None of these labeled structures would be negatively impacted. 2) Structure B 3) Structure C 4) Structure D
During periods of stress, the brain signals the adrenal glands to produce this hormone that stimulates the sympathetic nervous system:
Events that damage the cell's regulatory apparatus, trapping it in the G1 phase of the cell cycle, cause the uncontrolled division of cells called

Why are grassland and forest soils good for farming?A.
A layer of permafrost prevents the decay of organic material that enriches the soil.

B.
Too much water promotes chemical weathering and washes away nutrients.

C.
There is enough water to promote chemical weathering, but not enough to wash away nutrients.

D.
There is not enough rainfall to promote chemical weathering or retaining nutrients.

Answers

I believe the answer is C. Grasslands and forests do not have permafrost--present in tundra and taiga so A can be eliminated. B is not right because forests and grasslands definitely do not get TOO much rain, assuming they're not talking about tropical rain forests.

Tell whether the statements are TRUE or FALSE.1. It is important to recognize a person who is in need of first aid from choking, from someone who is not.
2. When a person is unconscious and not breathing but has a pulse, he or she is in respiratory arrest.
3. More than 3,000 americans die each year from choking.
4. The Heimlich maneuver was developed and introduced by Dr. Henry Heimlich in 1974.

Answers

1.) It is true that is important to recognize a person who is in need of first aid from choking, from someone who is not.
2.) It is true that when a person is unconscious and not breathing but has a pulse, he or she is in repository arrest.
3.) It is true that more than 3,000 Americans die each year from choking.
4.) It is true that the Heimlich maneuver was developed and introduced by Dr. Henry Heimlich in 1974.

All of the answers to these questions will be True.

1. It is important to recognize a person who is in need of first aid from choking, from someone who is not. - TRUE

2. When a person is unconscious and not breathing but has a pulse, he or she is in respiratory arrest. - TRUE

3. More than 3,000 Americans die each year from choking. - TRUE

4. The Heimlich maneuver was developed and introduced by Dr. Henry Heimlich in 1974. - TRUE

Isotopes of uranium are the most common fuel used in nuclear power plants. True/ False

Answers

This is true, they are a large unstable isotope that can be broken down into smaller more stable elements to release energy to power turbines and generate electricity

Answer:

True

Explanation:

Isotopes of uranium, specifically uranium-235 and uranium-238, are commonly used as nuclear fuel in power plants. When these isotopes undergo nuclear reactions, they release large amounts of energy, which can be used to generate electricity.

What enzyme unwinds or unzips the parent strand?

Answers

The helicase unwinds or unzips the parent stand

Where is the majority of energy stored in a molecule of atp?

Answers

Answer:

The answer is covalent bonds

Explanation:

Describe an ecosystem and identify the different trophic levels.

Answers

An ecosystem is a closed system consisting of living and non-living things.

Trophic Level 1: Primary Producer
Trophic Level 2: Primary Consumer
Trophic Level 3: Secondary Consumer
Trophic Level 4: Tertiary Consumer