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dexar [7]
2 years ago
3

Your friend has a dog with fleas. She goes to the pet store and buys over-the-counter flea medicine. It does not work. So she go

es to the veterinarian and explains that she just spent $80 on medicine that does not work. The vet casually says, “Oh yeah, that medicine does not work anymore.” Because you now understand natural selection, your friend asks you questions. Answer them with evidence.
- What do the resistant fleas do that the sensitive fleas do not?
Biology
1 answer:
Mandarinka [93]2 years ago
7 0

Answer:

Explanation:

The dog has fleas, but the medicine to counter this does not work. This means that the fleas have built up a resistance against the drug to ensure continued survival and reproductive success of these organisms. These resistant fleas may have existed in population as the population is always large but in small amounts. Thus, treatment with the drug will lead to the dieing out of the sensitive fleas and then leaving the resistant fleas with the favourable alleles to be selected for.

These favourable traits that have evolved against the drugs are then selected for and the organisms reproduce giving rise to more fleas with these favourable characteristics (being resistant to the drugs) such that their continued survival and reproductive is ensured compared to the sensitive fleas that die out.

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An increased rate of breathing as a result of an increased buildup of carbon dioxide in the bloodstream would be best described
ValentinkaMS [17]

Answer;

Responsiveness

Excretion

Explanation;

Excess carbon dioxide must be removed from the body to stop it reaching toxic levels. As the blood flows through the lungs, excess carbon dioxide passes out of the blood and into the alveoli by diffusion. It is then removed from the lungs when we exhale (breathe out).

-Carbon dioxide helps remove carbon dioxide (a waste gas that can be toxic) from your body. The lungs' intake of oxygen and removal of carbon dioxide is called gas exchange. Gas exchange is part of breathing.

8 0
2 years ago
We are usually least consciously aware of the processes and functions of which brain structure?
Kazeer [188]

Answer:

The answer is Brain Stem.

Explanation:

The brain part that we are least consciously aware of is the brain stem and the reason is because of how it operates and it's functions.

The brain stem is the part of the brain that is located at the end and controls the message flow between our body and our brain. It also regulates our physiological processes such as heart rate, blood pressure, breathing etc. without our notice.

I hope this answer helps.

8 0
2 years ago
A limbic system reward center located in front of the hypothalamus is called the
frez [133]
Your answer would be "nucleus accumbens"!
4 0
2 years ago
Read 2 more answers
Which of these conditions indicate positive feedback has occurred?
aleksklad [387]

Answer;

A) Blood pressure decreases greatly; blood flow to the heart is inadequate, and blood pressure decreases.

Explanation;

-With negative feedback, the output reduces the original effect of the stimulus. While in a positive feedback system, the output enhances the original stimulus.

-Negative feedback is the most commonly used feedback loop in the body. Negative feedback is used to negate or counteract a stimulus without completely eradicating it.

-One key difference between the two feedback is that positive feedback loops are used to eradicate a stimulus. Another key difference is that responses through positive feedback become more amplified over time. So once a stimulus activates a positive feedback loop it is not turned off until the stimulus is completely removed.

8 0
2 years ago
the excretions of living organisms are best categorized as which type of factor in an environment ? A.biotic B.abiotic C.living
erica [24]

Answer:

A) Biotic

Explanation:

It's definitely not abiotic and nonliving because they are living and who would categorized 'excretions of living organism' "living".

7 0
2 years ago
Read 2 more answers
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