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What kinds of valves are found in the human circulatory system and how do they differ?

The three main kinds of valves in the human circulatory system are atrioventricular valves , semi-lunar valves and pocket valves . Atrioventricular valves are found in the heart and separate the atria and ve...
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Answered by Elanor B. • Biology tutor
6238 Views

Décrivez un thème important traité dans le livre, le film ou la pièce que vous avez étudié(e)

Thérèse Raquin (1867) Le philosophe allemand Nietzche a déclaré que Dieu était mort. Cette idée a poussé Zola à écrire un roman où les personnages ne son affectés que par leur 'sang' et leur 'milieu'. En fai...
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Answered by Charlie D. • French tutor
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What are the two main forms of biological classification, and how do they differ?

Artificial classification is used to divide organisms by their characteristics, which can vary depending on the specific situation which you are considering. Features that are considered are known as analogo...
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Answered by Luke K. • Biology tutor
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How are red blood cells adapted to carry out their function?

Contain haemoglobin - a molecule that can bind reversibly to oxygen. Biconcave disk shape - increases surface area to allow more diffusion of oxygen. No nucleus - allows more space for haemoglobin. Flexible ...
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Answered by Lily C. • Biology tutor
11838 Views

Jack has 20 sweets. Will also has 20 sweets. Jack gives Will x sweets. Jack then eats 5 of his sweets. Will then eats half of his sweets. Write expressions for the number of sweets Jack and Will now have.

They both start with 20 sweets. To get the total number of sweets that Jack has, you need to take away x because that is the amount that he gives to will. Jack then eats 5 of his sweets so you need to take a...
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Answered by Lucy M. • Maths tutor
5601 Views