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What is the difference between ser and estar?

Describing people Unlike english, Spanish has two verbs for "to be": ser and estar. As a general rule ser is used to describe or answer questions about who or what something is, while estar describ...
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Answered by Thomas B. • Spanish tutor
5065 Views

What factors contribute to phenotypic variation between organisms?

Let us first understand what is meant by the term "phenotypic variation". Simply, the phenotype of an organism is its observable characteristics - like how it looks, how it behaves, and so on. Diff...
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Answered by Faheem M. • Biology tutor
17201 Views

How is oxygen moved from the lungs to the blood?

When oxygen reaches the alveoli of the lunngs, it diffuses into the blood. The oxygen enters the red blood cells and combines with the haemoglobin to form oxyhaemoglobin. When the red blood cells reach the t...
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How do I analyse a historical source?

Sometimes when faced with many historical sources at once that all discuss a similar topic, it can be hard to know where to start. By following a simple structure, you can be sure to achieve the best grades ...
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Answered by Beth B. • History tutor
4489 Views

Explain the difference between direct and indirect costs.

Businesses have many different costs to pay when running. We can categorise these costs into different categories, such as direct and indirect costs. A direct cost is though of as being affected by the numbe...
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Answered by Barnaby C. • Economics tutor
5273 Views