A food chain is a series of organisms that depend on the next organism as a source of food. A food web is a system of interdependent food chains.
Answer:
D
Explanation:
It could be C also, but when translating to mRNA you replace T with U. I'd go with D.
Explanation:
This much is undeniable. Based on the magnetic fingerprints locked into ancient rocks, we know that over the last 20 million years, magnetic north and south have flipped roughly every 200,000 to 300,000 years (this rate has not been constant over the planet's lifetime, though).
This could weaken Earth's protective magnetic field by up to 90% during a polar flip. Earth's magnetic field is what shields us from harmful space radiation which can damage cells, cause cancer, and fry electronic circuits and electrical grids.
