Which structure on the sperm propels in toward the egg

Tail

Explanation: Sperms usually consists of two regions.One is head and other one is tail. The tail part of the sperm propels it towards the egg and helps it to burrow through the egg coat.

The head region of the sperm contain condensed form of haploid nucleus. The DNA is packed extremely tight inside the head.

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the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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