The first box should be atoms, the second element, and the third box compound.
Hydrogen bonds<span> are much weaker than covalent bond because of its bond is formed through fundamentally electrostatic interactions.
Hydrogen bonds happen due to dipole-dipole attraction while covalent bonds happen when valence electrons are shared.
Reasons why complementary nucleotides across the double-stranded dna bond together using hydrogen bonds rather than covalent bonds are (1) the distance between two strands, (2) size of the bases, (3) geometry of each base.</span>
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➷ I'm not sure what the rest of the options are but an environmental effect of deforestation is soil erosion.
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Answer:
I don't know the exact word they want, but organisms use energy for motion and any activity they perform regularly. (eg: hunting, climbing, digging, etc.)
