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When do we use the verb ser and when do we use the verb estar?

In Spanish there are two different verbs for the verb "to be" in English, Ser and Estar. The two are not interchangeable, as they have two different uses. We use the verb ser when we are describing...
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Answered by Madeleine N. • Spanish tutor
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Is momentum a vector or a scalar quantity?

Momentum of an object is the product of its mass and velocity (p=m x v). Since mass is a scalar quantity and velocity is a vector quantity, we can derive that momentum must therefore be a vector quantity as ...
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Answered by Madeleine N. • Physics tutor
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What are the differences between aerobic and anaerobic respiration?

<p>There are two types of respiration that you need to know about - aerobic and anaerobic respiration. The main difference between the two types of respiration depend on whether oxygen is available or ...
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Answered by Madeleine H. • Biology tutor
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Describe the process of phagocytosis.

Phagocytosis begins when white cells called phagocytes recognise bacteria invading the body (pathogens). The cell membrane of one of these phagocytes then fuses around a single bacterium, engulfing it within...
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Answered by Abia N. • Biology tutor
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What are the key assumptions of the biological approach in Psychology?

Firstly, the biological approach assumes that human behaviour can be explained in terms of genes, hormones, evolution and the nervous system hence there is a focus on nature rather than nurture. Secondly, tr...
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Answered by Miraal M. • Psychology tutor
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