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Crude oil is a mixture of different hydrocarbons, which all have different lengths and must be separated by length into different useful 'fractions'. Fractional distillation achieves this by using the fac...

In portuguese nouns have gender- masculine or feminine. 

Most masculine verbs end with -o, -im, -om, and -um. Most feminine nouns end with -a, -ção, -dade or -gem.

Examples:

Masculine...

Both Imperfecto and Indefinitivo are past tenses.

Imperfecto is a tense used to describe states, emotions, circumstances, settings - it implies that the action has not been finite in the past. For ...

Synapses are chemical connections between neurons which do indeed slow down transmission. However, they provide the nervous system with many benefits that could not be achieved without them: They ensure t...

We say that the genetic code is degenerate because there are several codons, which code for the same amino acid. For example UCA, UCU, UCG and UCC all code for Serine. 

This is due to the fact that...