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xxTIMURxx [149]
3 years ago
8

Why was the Selective Service Act an important step toward winning world war 1 ?

Biology
1 answer:
nata0808 [166]3 years ago
8 0
It provided the large numbers of troops needed to reinforce the Allied effort.
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To free the rock from atop the perch, you need a ____________ , which could take the form of a person or a lever to free the roc
andrew-mc [135]

Answer:

Option (D)

Explanation:

In terms of chemistry, a catalyst is usually defined as the substance that is commonly used in a reaction in order to increase the rate of reaction, without getting consumed. It helps in the reduction of activation energy.

In the given case, the lever or a person can be considered as a catalyst because both of these will increase the efficiency (or rate) in removing the rock from the top of the perch. Thus, the lever or the human will remain the same after the removal of rock as a catalyst can be recovered after the reaction.

Therefore, the correct answer is option (D).

5 0
3 years ago
A physical system is best characterized as a collection of:
mafiozo [28]
<span>A physical system is best characterized as a collection of MATTER THAT HAS DISTINCT BOUNDARIES.

</span><span>How does this phenomenon validate the Law of Conservation of Energy? 
</span><span>The light energy travels through the water until it is reflected or absorbed.

</span><span>What conditions would most likely be present in this region?
Organisms growing on bare rock

</span><span>What is the best explanation based on these observations?
</span><span>Lobsters are adapting to cooler temperatures.
</span><span>- Ideal water temperature for lobster is around 53-64 degrees Fahrenheit. With the exceedingly warm waters (68 degrees Fahrenheit), lobsters are forced to move to the north where the temperature is ideal for their life cycles.</span>
6 0
3 years ago
Which element provides strength to the exoskeletons of clams and oysters?
Afina-wow [57]
Calcium provides strength as a element, though it is present as calcium chloride on the exoskeletons.
7 0
3 years ago
Approximately _____ of all traffic deaths occur within 25 miles of the home.
IRISSAK [1]
I personally would say 15% due to the fact that most traffic accidents occur more further from home
5 0
3 years ago
Some people have low levels of calcium circulating in the blood, a condition known as hypocalcemia. while for many this disorder
kap26 [50]

Answer:

low level of calcium would result in fewer signals sent between pre and post synaptic cells.

Explanation:

The calcium has a main role in signal transmission mechanism and here is the mechanism :

1-the impulse reaches the synapse (depolarization which is a voltage change).

2-the voltage gated calcium channels open and let calcium flow into the cell.

3-the calcium causes the synaptic vesicles to rupture and release chemical transmitters which cross the synaptic cleft and finally bind to receptors on the post synaptic cell (transmitting the signal)

so it's obvious that if calcium concentration decreases, the signal transmission also decreases.

8 0
3 years ago
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