So when the Moon<span> rotates around the </span>earth<span> is pulls the water away from the </span>earth<span>causing high tides. Low tide is caused by the </span>moon<span> and </span>sun<span> working at right angles to </span>each other<span>, their gravitational forces effectively cancel </span>each other<span>out.</span>
Black stuff from volcanos!
Answer:
By action potential nerve contract the muscle
Explanation:
The muscle contract when the nervous system sends action potential to the muscle. So the nervous system delivers signal to muscle, the first signal reaches the neuromuscular junction. The signals are passed by a chemical messenger called neurotransmitter release by motor neurons, the chemicals bring reaction and shorten the muscle fibre. When neurotransmitter are absent or reduce in concentration the process reverse and muscle relax again.
Answer:
A
Explanation:
<em>The correct option would be </em><em>A.</em>
<u>The presence of ammonia in the atmosphere of primitive earth provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in DNA. This has been proven through the simulation experiment of the primitive earth's atmosphere by Stanley Miller and Harold Urey.</u>
The water in the primitive atmosphere was formed from the condensation of water vapour from volcanoes that were characterics of the earth's environment while oxygen in itself is not needed for photosynthesis but a by-product of it.
Answer:
the frog and cricket are eaten by snake and soil bacteria all dead organisms are eaten by soil bacteria.
The sun is the energy source for grass which is in turn an energy source for crickets and soil bactiera. Snakes and frogs eat the crickets and snakes also eat the frogs. When all the animals including grass die then will get eaten by the soil bacteria.
Explanation:
