Top answers

What does a vaccine contain?

Short answer: Dead and/or inactive pathogens. Explanation (also to a further question: "How does this prevent infection later?") : Pathogens are microorganisms that cause disease. When the body is ...
MS
3834 Views

Solve the following simultaneous equations: 4x+y=10 and 2x-3y=19

To begin to solve this question, we need to re-arrange the equations presented so they both appear in terms of 3y=. This will allow us to get a value for y and thus a value for x. First re-arrange the first ...
HW
Answered by Hugh W. • Maths tutor
10430 Views

Solve this pair of simultaneous equations. 5x + 2y = 20 x + 4y= 13

One way to solve simultaneous equations is to express x in terms of y (or vice versa) and solve your new equation to find one of the values. You can then substitute this into your equation to work out the ot...
NB
Answered by Ned B. • Maths tutor
4782 Views

How do some toxic chemicals cause environmental and health problems? (2 Marks)

Persists in the environment/soil/water. Enters the food chain and builds up the higher up the chain you move. Can enter human tissue eventually.
TD
3268 Views

Describe the function of receptors in the skin. (2 Marks)

Detect surounding stimuli. Convert that information to impulses and send to the brain.
TD
6429 Views