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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 dead...

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, but one...

a is acceleration, v is velocity, s is position vertically: a = - g v = u - gt (by integrating with respect to t and setting initial speed u as constant of integration) s = ut -gt 2 /2 + s 0 (by integrating ...

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 integration by parts given an integral ∫f(x) dx, it involves wr...

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 decompose, the soil builds...