Chromosomes are turned on or off. Ex. genes for karatin (which makes hair) are turned on when they are on top of your head, but are turned off on the palms of your hands.
Answer:
The "Cambrian Explosion" refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on Earth.
Explanation:
A plucking<span> occurs when a rock and a stone become a frozen to the base or sides of the glacier and are </span>plucked<span> from the ground or rock face as the glacier moves and leaves the behind the landscape.</span>
Metamorphic rocks are formed from existing rocks, when it is exposed to great heat and pressure. This process would destroy any fossils inside the already existing rock.
Earthquakes are seismic waves formed in the central area of the earth. Propelling around the earth creating a force that is released on the earths crust creating an earthquake. :)