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Vikentia [17]
3 years ago
10

Unidirectional flow in the heart is ensured because the heart contains ___________.

Biology
1 answer:
jekas [21]3 years ago
3 0
<span>Unidirectional flow in the heart is ensured because the heart contains valves that prevent backflow.

These valves keep the flow of the heart going in one direction (hence the name "unidirectional").</span>
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The process of mitosis is the same in plant and animal cells until the division of the cytoplasm. At this stage, plant cells dev
luda_lava [24]

Answer:

D. Cell plate

Explanation: research

3 0
3 years ago
What protein looks looks like a cork screw?
loris [4]
I think it's amino acid
8 0
3 years ago
Prevailing winds cause ocean currents to move in the same direction as the winds
Anarel [89]

Answer:

claim 1

Explanation:

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Newton's first law of motion

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6 0
3 years ago
There are two species of freshwater shrimp that are introduced to a pond. The first species, Caridina cantonensis, is brightly c
Marina86 [1]

Explanation:

Natural selection is the mechanism that is responsible for the evolution of organisms.  

In the given case, the Freshwater shrimp has been introduced to a pond in which the two species with variations are introduced.  

The <em>C. cantonensis </em>is brighter in color whereas the <em>C. multidentata</em> is mottled drab in color. The predator fish can feed easily on the species which is brighter therefore <em>C. cantonensis</em> is more susceptible. The mottled drab species is not easily predated by the species.  

The 30 % offsprings of <em>C. cantonensis</em> can survive till the reproductive age  whereas 75% of C. multidentata. This shows that natural selection has acted on the color of the shrimp species selected against the predator fish species.

The species with mottled drab color is the result of the differential reproductive rate.

5 0
3 years ago
The graph shows the changes in the number of animal fauna's living on earth overtime in how the fauna's were affected by differe
eduard

Answer: C) The event at the end of the Triassic Resulted in the extinction of fewer fauna’s then in any other period

Explanation:

Looking at the graph, the event at the end of the Triassic resulted in the smallest dip in the amount of fauna in the graph. This means that this event resulted in the extinction of fewer faunas than any of the other five major events.

Option A is wrong as the event at the end of the Devonian decreased the number of Cambrian fauna.

Option B is wrong as the event at the end of the Cretaceous resulted in a decrease in the Paleozoic fauna.

Option D is wrong because the event that resulted in the Extinction of more fauna’s then in any other period was the event at the end of the Permian.

4 0
3 years ago
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