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STatiana [176]
3 years ago
15

Explain why sponges and cnidarians were the first animals to evolve

Biology
2 answers:
malfutka [58]3 years ago
6 0
Once the Earth was full of water (ocean) after volcanic activities the mainland became land ( sorry about my english i am hungarian and i am still learning the language )
alisha [4.7K]3 years ago
5 0
Sponges and cnidarians were the first animals to evolve from a multicellular ancestor. The oldest fossil evidence of multi-cellular animals is burrows that appear to have been made by smooth, worm like organisms. Between 620 and 550 million years ago large, complex, soft-bodied multi-cellular animals appear in the fossil record.
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Reactions that hydrolyze the phosphodiester bonds split the DNA molecule between the phosphate groups and the hydroxyl groups of the two sugar groups.

In DNA there is a covalent bond through a phosphate group that connects the hydroxyl group (OH) at the 5' position of the pentose sugar and the hydroxyl group at the 3' position of the pentose sugar of the next nucleotide. This covalent bond is called a phosphodiester bond because chemically the phosphate group is in the diester form.

In other words, the phosphodiester bond connects the sugar in one nucleotide to the sugar in the next nucleotide, so this bond simultaneously connects the two consecutive nucleotides to form a polynucleotide chain. If there is an enzyme that catalyzes the hydrolysis of covalent bonds that combine nucleotides, what happens is that the phosphodiester link between deoxyribose sugars will break.

Learn more about the phosphodiester bonds at brainly.com/question/23660733

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<span>C. wolf 

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