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All verbs which indicate movement (or lack thereof) require sein. Everything else requires haben. For example, 'ich bin gegangen,' and 'ich bin geblieben' both refer to movement/lack of movement, which is...

The subjunctive mood is used to indicate uncertainty, or possibility, in french. For example you would use the subjunctive mood when talking about your feelings, judgments, doubts and opinions, and when o...

Active transport is the transport of substances against their concentration gradient with the use of energy. Molecules naturally flow down their concentration gradient, ie. from where they are more concen...

We will begin by eliminating fractions in the equation. To do this, the equation will be multiplied by 4 and (x+2), as these are the denominators of the two fractions.
Multiplying by 4 gives:x - (8x/...

As you breathe in, air passes down your trachea and then into the bronchi and bronchioles. The bronchioles divide further into even narrower branches which end in small air filled sacks called alveoli. Th...