Top answers

Biology
GCSE

Why is the human circulatory system a double system?

The human circulatory system consists of the heart - a pump and a series of tubes - the blood vessels containing the blood. There is an atrium and a ventricle on each side of the heart and the two sides c...

YZ
Answered by Yuhui Z. Biology tutor
4334 Views

Why should we not overprescribe and overuse antibiotics?

Antibiotics are used for killing bacteria and therefore, it can act as a selection pressure. This means that the bacteria can mutate, in order to avoid being killed and this would be a favourable mutation...

NR
Answered by Niva R. Biology tutor
3198 Views

How does vaccination provide immunity?

Pathogens are microorganisms that can cause disease. If they enter the body, they can start an immune response. On their surface, they have antigens, which are substances that start that immune response. ...

LF
Answered by Lana F. Biology tutor
2793 Views

How is information passed across a synapse?

A synapse is a junction between neurons. For neurons to communicate signals to each other, it is vital that information can cross the synapse when appropriate.

The neuron before the synapse (the pr...

AT
Answered by Alex T. Biology tutor
18525 Views

Which of these is a correctly balanced equation for respiration? C6H12O6 + 3O2 → CO2 + 3H2O C6H12O6 + 6O2 → 6CO2+ 6H2O C6H12O6 + 6O2 → 6CO2 + 3H2O

Teaching points:

Go through balancing equations 

Formalae of glucose 

Different types of Respiration - and how to balnce other equations 

Respiration in animals vs plants 

...
AP
Answered by Anish P. Biology tutor
8888 Views

We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning