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We add probabilities when the corresponding events are alternatives, e.g. P(rolling a 4 on a pair of dice) = P(rolling a 1 and a 3) + P(rolling a 2 and a 2). These are mutually exclusive events which can't h...

Economies are made up of three sectors; the primary sector, which involves extraction of raw materials (e.g. timber), the secondary sector, which is concerned with manufacturing (e.g. turning timber into cha...

EM waves invariantly travel at the speed of light, and can do so in a vacuum. They transfer energy from their source to the absorber. Some kinds of EM waves can be reflected and refracted. The spectrum of el...

Active transport is a process where particles move from an area of low concentration to an area of high concentration against a concentration gradient. In order for particles to move against a concentration ...

The subjunctive is used in Spanish to present possibility - something that isn't certain. For example, if I'm not sure if it will rain or not, I would say 'Es posible que lluvie' (It is possible that it will...