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mario62 [17]
3 years ago
9

What event marks the start of the Islamic calendar?

Social Studies
2 answers:
Novosadov [1.4K]3 years ago
8 0

It's D "Muhammad's return to Mecca

nexus9112 [7]3 years ago
4 0

Answer:

C.the hijra

Explanation:

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In one of the most shameful violations of research ethics to date, nearly 400 African American men from __________ were not info
grigory [225]

Answer:

Tuskegee.

Explanation:

As the exercise describes, one of the most shameful violations of research ethics to date, nearly 400 African American men from Tuskegee (later called the Tuskegee syphilis experiment) were not informed that they had been diagnosed with syphilis and were not provided with available, effective treatments for this illness. The aim of this study was to observe and analyze how syphilis proceded when untreated. So, this men were told they were being treated for free.

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3 years ago
A rat in a Skinner box receives a food pellet every ten times the bar is pressed. The rat is on a _____ schedule of reinforcemen
e-lub [12.9K]

Answer:

Fixed ratio

Explanation:

The Fixed ratio schedule is used in ope-rant conditioning. Ope-rant conditioning is work on the relationship of response and stimulus due to that the behavior of a subject has been changed.

As the name indicated the reinforcement is being given after a fixed ratio for example after every ten times the reinforcement is provided to the rat in the box. So the rat can learn the behavior.

In this type of reinforcement, the schedule will remain constant. If the reinforcement is not provided after a fifth, tenth or any fixed number then it won't be a fixed ratio.  

7 0
3 years ago
Who won in the for Sumter attack
diamong [38]
The confederate states won
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3 years ago
Please help me, I have to fill in the blanks and I am not so smart
andriy [413]

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I would say stone because diversity fits the one above it and it makes more sense then stone does in the sentence.

7 0
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