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Why is water less dense in its solid state?

This is because in liquid state water molecules are close to each other, but in an disorganised manner. Each water molecule forms around 3.4 hydrogen bonds with other water molecules. However, in solid state...
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Answered by Cezar B. • Chemistry tutor
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What are the distinguishing features of a mammal compared to other classes of animals?

All classes of vertebrates have their own distinguishing features that we can use to identify if an animal is indeed a mammal or not. The main classes of vertebrates can be simpified into mammals, fish, amph...
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Answered by Jamal A. • Biology tutor
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1. Describe how different parts of the human digestive system help to break down molecules of fat so that they can be absorbed into the body.

Fat is first processed by mechanical breakdown in the mouth through chewing and in the stomach through its ‘churning’ action. Lipase, an enzyme produced in the pancreas, converts fat in the small intestine i...
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Answered by Ruby L. • Biology tutor
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What are the functions of white blood cells?

The main role of white blood cells is to protect the body against invasion by disease-causing microorganisms (pathogens), such as bacteria or viruses. They do this in 2 main ways: phagocytosis and antibody p...
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Answered by Neha K. • Biology tutor
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Explain how you would expect glycogen levels in the liver to change after a meal, and why it would change in that way.

Glycogen levels are expected to increase in the liver after a meal. This is due to the digestion of the meal leading to an increase in blood sugar levels, triggering insulin release from the pancreas. Insuli...
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Answered by Daniela M. • Biology tutor
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