Answer:
electron transport chain
Explanation:
Im not 100% sure but this should be it.
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Na (sodium), because alkali metals are not found freely in nature due to their high reactivity. (In this group are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Answer:
Explanation:
roundworms have a body cavity with internal organs.
A roundworm has a complete digestive system, which includes both a mouth and an anus.
Answer:A
Explanation:
The mass of an electron is equal to the mass of a neutron
Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron.
Answer:
D. The life cycle of a high-mass star
Explanation: