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What are tropisms?

A tropism is a growth in a plant in response to a stimulus. The stimulus could be a change in the direction of light or a water source. To recap, a stimulus is a change in the environment of an organism that...
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Answered by Holly P. • Biology tutor
15565 Views

Explain the exchange of oxygen between an alveolus and a capillary.

The blood in the capillary has just returned to the lungs from the rest of the body, so contains a low concentration of oxygen. The alveolus contains air that has just been breathed in by ventilation, so it ...
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Answered by Anastasia D. • Biology tutor
3739 Views

Work out area of shaded region in terms of pi. (https://prnt.sc/hqfbsl) [Question link]

Area of square : Base x Height. Area of Circle : π x (Radius) 2 . Looking at the diagram we are given the dimensions of the base or height of the cube (as all sides are equal in a square) and the diameter of...
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Answered by Mohammed A. • Maths tutor
11882 Views

How do I know which case to use?

There are 4 cases in German- Nominative, Accusative, Dative and Genitive. First you must know the gender of the noun to work out the case. Nominative is used for a person or thing which does the action of th...
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Answered by Daniel W. • German tutor
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Explain how the evaporation of a liquid causes the temperature of the remaining liquid to decrease.

(Explain within the lesson)
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Answered by Finlay M. • Physics tutor
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