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Sati [7]
3 years ago
8

Where can evidence of the struggle to survive be observed today?

Biology
1 answer:
Jlenok [28]3 years ago
3 0
The concept of the struggle for existence<span> concerns the competition or battle for resources needed to live. It can refer to human society, or to organisms in nature. The concept is ancient, and the term </span>struggle for existence<span> was in use by the end of the 18th century. From the 17th century onwards the concept was associated with a population exceeding resources.

Hope this helped!
STSN</span>
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Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membr
Margaret [11]

Answer: the membrane channel

Explanation:

In passive diffusion, the small water molecules can move across the phospholipid bilayer seen in blue. This layer acts as a semi-permeable or selectively permeable membrane; its hydrophilic heads are attracted to water (seen facing outwards) while its water-repellent hydrophobic tails face towards each other- allowing  molecules of water to diffuse across the membrane along the concentration gradient.

Thus the water will move from an area of high concentration  to an area of low concentration, until the system reaches a steady state called equilibrium- after this, there will be no net movement of water. Similarly via osmosis, the water passes through the membrane due to the difference in osmotic pressure on either side of the phospholipid bilayer this means that the water moves from regions of high osmotic pressure/concentration to regions of low pressure/ concentration to a steady state.

The dialysis tubing mimics a semi permeable membrane; it only allows water and small molecules of iodine to cross into the bag containing starch. The tubing is impermeable to starch;  these large molecules require the aid of protein omplexes called membrane channels, in order to move across the membrane and against the concentration gradient.

5 0
3 years ago
Jelaskan peranan mikroorganisme yang hidup di kolon dalam proses pencernaan
Sloan [31]
<span>microorginisms tinggal di usus memecah makromolekul / membantu pencernaan</span>
3 0
3 years ago
What scientific hypothesis could be used to support the theory that Wood Thrush decreases are not due to deforestation? could it
bulgar [2K]

Answer:

A scientific hypothesis can be described as a tentative statement which can either proved to be right or wrong through the support of the experiments being performed.

The possible hypothesis for the theory that Wood Thrush decreases are not due to deforestation can be as follows:

<em>'If the population of the Wood Thrush is not affected by deforestation, then the population of the Wood Thrush will remain the same when deforestation occurs in a particular area.' </em>

3 0
3 years ago
PLEASE ANSWER QUICKLY
Rasek [7]

Answer:

incomplete dominance

Explanation:

This is because incomplete dorminance is a type of inheritance pattern in which a dorminant allele does not completely masked the effect of recessive allele. The recessive allele is expressed little and the dorminant. Example is the nose size. The allele for big nose and recessive allele for small nose are not completely dorminant.

6 0
3 years ago
Explain how water erosion by groundwater can form a cave.
prohojiy [21]
Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
4 0
3 years ago
Read 2 more answers
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