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RNA Is synthesised in the nucleus from a DNA template. During synthesis of RNA, the two strands of the DNA molecule separate temporarily; one of these strands is used as a template for synthesis of an RNA...

The heart is composed of myogenic muscle and generates its own rate in normal condition. This rate can be modified during increased or decreased respiratory demand. 
The heart beat is initiated by a ...

Anaerobic decay produces two main gases. Carbon dioxide and Methane.
Methane, more importantly, is one of the five greenhouse gases that results in global warming.

The heart is divided in half by a septum, giving a right side and a left side. Both sides will also be divided again and have an atrium on the top and a ventricle on the bottom. We will begin at the left ...

In platyhelminthes digestion is both intracellular and extracellular whereas in annelida and chordata digestion is completely extracellular.