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Biology
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Compare the advantages and disadvantages of light and electron microscopes.

Electron microscopes have higher magnification and higher resolution than light microscopes. Scanning electron microscopes can be used to examine the surface of cells and structuresLight microscopes can b...

TD
17722 Views

How does natural selection occur?

There are two important terms to understand (and state in an exam!) to answer this question. 1) Genetic diversity = the number of different alleles of genes

TW
Answered by Tess W. • Biology tutor
4155 Views

Why do insects and other animals need developed transport systems?

They have a high metabolic rateAs a result, they have a high oxygen and glucose demandDiffusion is not efficient alone as it is too far

FB
Answered by Freya B. • Biology tutor
4037 Views

Describe the sequence of events of the clotting cascade that will lead to a blood clot in a damaged blood vessel

Thromboplastin is released from damaged tissue and platelets, which activates an enzyme that catalyses the conversation of the protein prothrombin to thrombin. This occurs in the presence of Calcium and V...

LT
Answered by Laura T. • Biology tutor
4313 Views

What gives rise to antibiotic resistance?

Key pointsVARIATION: A population of bacteria aren't all identical, even having all derived from a single bacterium. Rapid genetic exchange gives rise to mutations. SELECTION PRESSURE: By adding th...

AS
Answered by Aman S. • Biology tutor
2426 Views

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