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When a cell divides, the number of chromosomes in that cell does not change. So if a cell had 40 chromosomes in it before it divided, it would still have 40 chromosomes in it after it had divided.

Indicator species are organisms whos presence or absense may indicate something about the environement. For example, an increase in organisms that are not dependant on oxygen to survive (also known as ana...

Command words are important and you should check carefully exactly what the question is actually asking for. If a question asks you to 'compare', all you need to do is point out similarities and differenc...

That’s a really good question. Well are you familiar with the concept of Natural Selection? (assume correct explanation from the student). Yes, you’re right. It is in fact by this same mechanism that bact...

The electrical activity of the heart begins in the sinoatrial node which is a collection of pacemaker cells located in the right atrium. These cells spread electrical activity across the atrium causing bo...