Answer:
Covalent bond is a primary chemical bond formed by the sharing of electron pairs
Hydrogen bond is a weak electrostatic attraction between the hydrogen and an electronegative atom due to their difference in electronegativity.
Oh! Just did this in school!
Eukaryotic cells are more complicated than prokaryotic. Eukaryotic cells have DNA in their nucleus, they have more than one chromosome, lysosomes, preoxysomes, mitochondria, cytoskeleton, golgi apparatus
photosynthesis
hope that helped XD
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Mars is just a fraction the size of the Earth, so it cooled more rapidly. And as it cooled, its molten iron core hardened. As a result, Mars stopped generating its magnetic shield. And, according to one theory, this left its atmosphere to be scoured away by the solar wind.
