They absorb food from their environment and release ammonia into their environment through their body surface because their body is very flat, due to the lack of coelom
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There are two correct answers:
1. A sequence of DNA that inhibits the action of enhancers in a position-dependent manner. Those are enhancer-blocking insulators and when an insulator is located in between a promoter and an enhancer, it prevents the influence of the enhancer on the promoter.
<span>2. A segment of DNA that forms supercoiled heterochromatin that is devoid of any DNA-regulator binding. Those are barrier insulators and they prevent euchromatin (transcriptionally active region) from turning into heterochromatin (transcriptionally inactive).</span>
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