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earnstyle [38]
3 years ago
11

A group of scientists believes that a pigment found in red vegetables helps cells to live longer. They test their theory by inje

cting this pigment into live cells growing in a test tube. After two days, the scientists count the number of healthy cells in the test tube and compare the results to a tube of cells that did not receive an injection of this pigment. What is the limitation of this experiment?​
Biology
1 answer:
Amanda [17]3 years ago
3 0
The limitation is cels
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Samuel ate some vegetable soup. What process is at work to allow Samuel to break down the soup so that his body will be
Andru [333]

Samuel ate some vegetable soup. <u>Digestion</u> process is at work to allow Samuel to break down the soup so that his body will be  able to produce energy.

<u>Option: D</u>

<u>Explanation:</u>

There are majorly four steps in food processing in human body, these are ingestion, digestion, absorption and elimination. There are six major phases covered by digestion: ingestion, acceleration, mechanical or physical digestion, chemical digestion, absorption and defecation. The first of these procedures, ingestion, relates to the absorption of food via the mouth into the food canal.

Digestive system allow the transformation of massive insoluble food molecules into small water-soluble food components to dissolve them into the watery plasma of the blood. Many smaller particles are ingested into the bloodstream in certain species through the small intestine.

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3 years ago
A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches. C
LUCKY_DIMON [66]

Answer:

A) With the closer spacing for the rows, the growing  corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation.

Explanation:

If the space among plants is less, the shadow that they are going to produce is going to reduce the need of water, so they production will rise and the cost to maintain the crops will be less, so the producer can double the profits.

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3 years ago
​The urethra carries urine outside of the body, and the corpus cavernosum carries sperm outside of the body. true false
Elina [12.6K]

Answer: False

Explanation:

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Urethra is made of two components. Prostatic urethera is the part that runs from the bladder through the prostrate.

The penis is only organ which carries both the fluids out of the body.

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Which of the following best explains why herring gull chicks were one of the first species to exhibit the effects of pollution,
prohojiy [21]
The correct answer is A.
Toxins and various pollutants increase in concentration through the food chain in a process called biomagnification. This means that the organisms on the top of the food chain, like the herring gull, have many times greater concentration of toxins than the lower food chain level organisms because they prey on lower food chain level organisms. If a herring gull ears 100 herrings, it will have a 100x times greater concentration of toxins in its body than a herring.
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3 years ago
How is HIV is a modern-day driving force for human evolution?
juin [17]

Answer:

Testing positive for HIV means a high chance of death and a good chance of lower reproduction rates. But some people are immune to HIV, which makes them more evolutionarily fit, likely to live longer, likely to reproduce more, which would increase the frequency of the immune allele in the population. Over time, this increase in frequency of the gene that causes immunity could spread across the human race and cause it to evolve.

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3 years ago
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