Which of the following periods is the earliest during which animals may have appeared?
ordovician period
cambrian period
ediacaran period
cryogenian period

The correct answer is D. Cryogenian period

Explanation

The Cryogenian period (720 million years ago) is known as the period in which the first animals of the earth appeared, which were identified using fossils, these animals were multicellular organisms similar to sponges. Scientists claim that they can be ancestors of modern animals or extinct organisms of which nothing is known and that diversify into multiple forms during the Ediacaran period. So, the correct answer is D. Cryogenian period

yes you are doing it right great gob

explanation:

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.