Read the passage to answer the question. Even though scorpions are related to spiders, there are many differences between
the two organisms. One difference is that scorpion young do not hatch from eggs as
spiders do. Scorpions are born live, two at a time, and they immediately crawl onto
the mother's back for protection and care. They remain there for two weeks as they
grow big enough to take care of themselves.
Scorpion cells undergo aerobic respiration, just as human cells do.
During aerobic respiration, which process takes place?
Oxygen is used, and ATP is made.
Carbon dioxide and glucose are made.
Glucose and oxygen are released.

the correct answer was location c, because earth is tilted away from the sun at this time

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.