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describe Charles Darwin's theory of evolution via natural selection (3 marks)

(1) A mutation / variation in an individual(2) makes them better adapted to survive in their environment(3) This allows them to reproduce (4) Therefore passing on their genes to the next generation.For examp...
NJ
Answered by Nikola J. • Biology tutor
4119 Views

(x+3)(x+2)

Inner inner + outer outer + inner outer + outer innerCheck if anything could be added together to simplify the terms Result = x 2 +5x+6
AO
Answered by Abdelrahman O. • Maths tutor
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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
14784 Views

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
4114 Views

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
9186 Views