2.) how does a hydrogen bond compared to a covalent bond?

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'A hydrogen bond is a strong form of a covalent bond. A covalent bond is one where two nonmetals share electrons. A hydrogen bond is where a hydrogen shares electrons with a very electronegative element, such as oxygen, nitrogen and fluoride.

vascular tissue transports materials from the environment into the plant.

typically, most spiders possess eight eyes. however, others have as many as 12, and some don't have any. these eyes are for detecting light from dark, deciphering shapes and for gathering their prey.