Answer:
Considering the formation of sedimentary rocks, the fossils in layer C are the oldest. Sedimentary rocks form in layers, with the oldest rock at the bottom. So, the fossils in layers A and B are newer than the ones in layer C. The fossils in layer A are the newest fossils
Explanation:
The answer is D. Speciation
The laboratory can be improved by calibrating measurement tools and organizing the parts that help laboratory work.
<h3>What is lab organization?</h3>
The expression lab organization makes reference to the strategies used to improve our performance in the laboratory.
Labs must include different devices and tools such as eyewash devices, biosafety cupboards, emergency showers, etc.
In conclusion, the lab can be improved by calibrating measurement tools and organizing the parts that help laboratory work.
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<span>Big Bang, the universe is still expanding. Slowly the planets get further away from each other. It's the third planet from the sun, some believed that the earth was in the center of the universe (geocentric) and now we believe the sun is in the middle. (Heliocentric)</span>
Answer:
A- Acetylcholine is released by axon terminals of the motor neuron.
Explanation:
The general mechanism of muscle contraction can be explained as follows:
a) The action potential which is generated, travels along the motor nerve to its ends on muscle fiber (or motor end plate) at the neuro-muscular junction.
b) The nerve endings then secrete small amounts of neurotransmitter called acetylcholine.
c) The actylecholine binds to the receptors on the membrane of muscle fiber and opens the voltage gated sodium channels.
d) Opening of these channels leads to flow of large quantities of sodium ions into the muscle fiber which ultimately results in initiation of action potential in muscle fiber.
e) This action potential depolarizes the fiber including the T-tubules, triggering the release of calcium ions from sarcoplasmic reticulum.
f) The calcium ions thus released initiated the process of muscle contraction.
