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A large amount of untreated sewage entered the river. Many fish died. Untreated sewage contains organic matter and bacteria. Explain why many fish died. (5)

Sewage entering the water caused plants to die.Bacteria then decayed this dead organic plant matter (1) through digestion (1).These bacteria will carry out aerobic respiration, using oxygen (1).This therefor...
JC
Answered by Joy C. • Biology tutor
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Solve the following pair of simultaneous equations: 2y - x = 3, y + 4x = 4

There are 2 main methods for solving simultaneous equations: 1) by substitution, and 2) by elimination . Have a look at how each method works and pick the one that's best for you! In order to make my explana...
SP
Answered by Saranya P. • Maths tutor
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Compare the structure of eukaryotic and prokaryotic organisms

Typically, such questions are 6 markers. Prokaryotic cells are often found in bacteria, the smallest organisms, often made out of single cells. Eukaryotic cells are much more complex and are often found in a...
AP
Answered by Alexandra P. • Biology tutor
9314 Views

Outline what is meant by the term bystander behaviour.

Bystander behaviour refers to the actions a person may or may not take when they are a witness in an emergency situation. The choice of action may depend on a number of factors which can increase or decrease...
RH
1954 Views

What are Newton's 3 laws of motion?

Newtons first law states that is an object is moving it will continue to do so in a constant direction and uniform velocity unless acted upon by an external force.Newtons second law states that the change in...
MZ
Answered by Martynas Z. • Physics tutor
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