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3 years ago

When two species compete for the same limited, vital resource, one will become extinct. this is knows as _________?

1 answer:

3 0

Natural Selection

The theory of natural selection illustrates that dominant traits are preserved over time through phenotypes (the result of environmentally influenced by genotype).
Completion is the force of natural selection where the strongest organisms, competing for the same food or niche, win, resulting in the weaker organism becoming extinct or changing food dependence or niche to survive.

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I only need number 5. Pls help. It shouldn’t take long

tankabanditka [31]

The correct answer is D

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3 years ago

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How do carbohydrates fuel protein function

Artemon [7]

Answer:

nutrients are digested into simpler compounds

Explanation:

These nutrients are digested into simpler compounds. Carbohydrates are used for energy (glucose). Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.

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3 years ago

A sand storage tank used by the highway department for winter storms is leaking. As the sand leaks out, it forms a conical pile.

harina [27]

Answer:

Rate of change of volume of the pile $= 54\pi$

Explanation:

Given -

Rate of increase of the base of the pile $= 0.75$ inches per minute

Height of the pile $= 2 *$ the radius of the base

Let "h" be the height of the pile and "r" be the radius of the base.

Then $h = 2* r$

Radius "r" $= 6$ inches

Rate of change of radius i.e

$\frac{dr}{dt} = 0.75$

Volume of conical pile

$\frac{\pi }{3} * r^2 * h\\= \frac{\pi }{3} * r^2 * 2 * r\\= \frac{\pi }{3} *2* r^3$

Change in volume of conical pile

$\frac{dV}{dt} = \frac{dr}{dt} * \frac{6* \pi * r^2 }{3}$

Substituting the value of rate of change of radius, we get -

$\frac{dV}{dt} = 2 * \pi * (6^2) * (0.75)\\\frac{dV}{dt} = 54 \pi$

Rate of change of volume of the pile $= 54\pi$

8 0

3 years ago

Explain how the water vascular system allows an echinoderm to move along the ocean floor. Please help!

astra-53 [7]

Answer: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals.

Explanation: The radial canals carry water to the ampullae and provide suction to the tube feet.

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3 years ago

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What term is used to describe a substance given in clinical trials that does not contain the drug?

HACTEHA [7]

Answer:

Placebo, Is used to describe a substance given in clinical trial that does not contain the drug.

Explanation:

Clinical trials are done to evaluate the effectiveness of a drug in treating a particular medical symptom or disease.
In such case a placebo is used as a control in the experiment.
A placebo contains all the components as the medicine except for the drug that is being tested.
A placebo is given to one group of patients having the symptoms for which the drug is tested while another group of patients with same symptoms are given the drug.
If the group that was given the drug show symptoms of cure while the group that was given placebo does not show changes. Then the drug is said to be effective.

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3 years ago