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3 years ago

Explain why the growing of willow for biofuel is an example of sustainable development.

1 answer:

5 0

Growing willow for biofuel is sustainable development because it is a source of fuel which potentially will never run out. For every willow tree that is cut down, another can be planted in its place. This means that the source of fuel is potentially limitless and subsequently sustainable.

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The less-movable end of a skeletal muscle is the

Sergio039 [100]

Answer: D). Proximal end

Explanation:

The less moveable end of the skeletal muscle is the medial or proximal end. It can be found near the point of attachement of the bones called as origin. It can be observed near the midline of the body.

5 0

3 years ago

Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to it

Vadim26 [7]

Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.

When the neurons get excited, the sodium ions start to enter by sodium channels.

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2 potassium ions pumped into the cell through the plasma membrane.

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

4 0

3 years ago

Read 2 more answers

During alcohol fermentation what is converted into ethanol

Galina-37 [17]

Answer:

Alcoholic fermentation is a complex biochemical process during

which yeasts convert sugars to ethanol, carbon dioxide, and other

metabolic byproducts that contribute to the chemical composition

and sensorial properties of the fermented foodstuffs.

7 0

2 years ago

1. How did dark matter affect the development of structures in the early universe?

-Dominant- [34]

Answer:

1. It seeded the development of galaxies

2. The percentage of dark matter has shrunk in scientists' estimates since the 1980s

The percentage of unknown material has grown in scientists' estimates since the 1970%

3. Supernovae that are moving away at an accelerating rate.

Explanation:

1. How did dark matter affect the development of structures in the early universe?

It seeded the development of galaxies.

It seeded the development of quasars.

It cooled pockets of gas to form nebulae.

it became part of black holes

2. How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.

The percentage of dark matter has shrunk in scientists' estimates since the 1980s

The percentage of unknown material has grown in scientists' estimates since the 1970%

The percentage of ordinary matter has grown in scientists' estimates.

The percentage of dark energy has shrunk in scientists estimates

3. Which is evidence for the existence of dark energy?

Pulsars that seem to be moving closer at an accelerating rate.

Supernovae that are moving away at an accelerating rate.

Black holes that are expanding at a constant rate.

Galaxies that are rotating at a constant rate.

<u><em>Please don't use these answer's to cheat they are to help only.</em></u>

6 0

3 years ago

Which statement provides the best description of the interphase portion of the cell cycle?- Interphase is a resting stage prior

stiks02 [169]

Answer:

During interphase, a cell is metabolically active

Explanation:

Cell cycle is divided into two stages: interphase (lasts 3/4 of the cycle) and phase M (1/4 of the cycle).

Interphase is also divided into three stages:

Phase G1

Protein and RNA synthesis is done.

Phase S

DNa synthesis is done.

Phase G2

Protein synthesis continues and the cell grows to start the division.

4 0

3 years ago