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How does a vaccine prevent infection?

When vaccine is given small amounts of the dead or inactive pathogen are inserted in to the blood, this activates the body's white blood cells which then produce antibodies. These antibodies destroy the d...

RB
Answered by Rosie B. Biology tutor
4967 Views

When should you use 'por' and 'para'?

When learning Spanish it’s very easy to get confused over when to use ‘por’ and ‘para’ in a sentence since both mean ‘for’ in English. There are a variety of contexts in which both words can be used, b...

SL
Answered by Sofia L. Spanish tutor
4667 Views

how to find flight time/distance and greatest hight of projectiles?

is acceleration, v is velocity, is position

vertically:

a = - g

BJ
Answered by Ben J. Maths tutor
5257 Views

What's the deal with Integration by Parts?

EXPLANATION:

Integration by parts states that  ∫uv' dx = uv -  ∫u'v dx, where u & v are funcions of x and the notation u' means du/dx.

to do inte...

BJ
Answered by Ben J. Maths tutor
6002 Views

What is the difference between primary and secondary succession?

Primary succession starts from bare rock, so no soil is present at the start. Over time the pioneer organisms (such as moss and lichen) break the rock and as the organisms die and deco...

SP
Answered by Sarah P. Biology tutor
47473 Views

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