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3 years ago

About fifty thousand years ago ______ formed meteor crater

2 answers:

6 0

Answer to this question is d because erosion does not form meteor crater‘s neither does glacitations or earthquakes because earthquake split up the place in half or quarters and astroid are the only things that can make a meteor crater

bixtya [17]3 years ago

3 0

D. an asteroid because an asteroid is the only thing that can form a meteor crater.

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A) Compare and contrast diffusion, passive transport (diffusion & facilitated), primary active transport and secondary activ

zheka24 [161]

Answer:

Passive transport: It does not need any energy to occur. Happens in favor of an electrochemical gradient. Simple diffusion and facilitated diffusion are kinds of passive transport.

Simple diffusion: molecules freely moves through the membrane.

Facilitated diffusion: molecules are carried through the membrane by channel proteins or carrier proteins.

Active transport needs energy, which can be taken from the ATP molecule (Primary active transport) or from a membrane electrical potential (Secondary active transport).

Explanation:

Diffusion: This is a pathway for some small polar hydrophilic molecules that can freely move through the membrane. Membrane´s permeability depends on the size of the molecule, the bigger the molecule is, the less capacity to cross the membrane it has. Diffusion is a very slow process and to be efficient requires short distances and pronounced concentration gradients. An example of diffusion is osmosis where water is the transported molecule.

Facilitated diffusion: Refers to the transport of hydrophilic molecules that are not able to freely cross the membrane. Channel protein and many carrier proteins are in charge of this passive transport. If uncharged molecules need to be carried this process depends on concentration gradients and molecules are transported from a higher concentration side to a lower concentration side. If ions need to be transported this process depends on an electrochemical gradient. The glucose is an example of a hydrophilic protein that gets into the cell by facilitated diffusion.

Simple diffusion and facilitated diffusion are passive transport processes because the cell does not need any energy to make it happen.

Active transport occurs against the electrochemical gradient, so it does need energy to happen. Molecules go from a high concentration side to a lower concentration side. This process is always in charge of carrier proteins. In primary active transport the energy needed comes from the ATP molecule. An example of primary active transport is the Na-K bomb. In secondary active transport, the energy comes from the membrane electric potential. Examples of secondary active transport are the carriage of Na, K, Mg metallic ions.

7 0

3 years ago

How did Burmese pythons become an invasive species?

g100num [7]

Answer:

Explanation:

3 0

3 years ago

Read 2 more answers

What is the largest source of energy on earth

tester [92]

Answer:

solar or hydroelectric

Explanation:

3 0

3 years ago

Read 2 more answers

explain why seasons are not the same at the north and south poles all years long. (atleast 3 to 4 sentences)

Goryan [66]

There not the same because the tilt of the earth axis is 22 degrees.The sun is directly overhead at either one of the tropics of Cancer or Capricorn every six months giving high temps in these regions.If there wasn't any tilt in the earth axis there will be no season's.

4 0

4 years ago

Which of the following positions is essential in radiography of the paranasal sinuses?A ErectB RecumbentC ObliqueD Trendelenburg

34kurt

Answer:

Erect.

Explanation:

Paranasal sinuses are the group of air filled sacs that are present around the nasal cavity. Paranasal sinuses are present four in numbers. These are maxillary sinuses, frontal sinuses, ethmoidal sinuses and sphenoidal sinuses.

The radiography of paranasal sinuses using X ray technique is helful in medical diagnosing. The erect position provides the best image for the radiography of paranasal sinuses.

Thus, the correct answer is option (A).

8 0

3 years ago