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The perfect tense makes a distinction between the perfect tense (I have gone out) and the simple past (I went out). 

The form constits of the verb haber:

he

ha...

Diffusion is the movement of particles from an area of high concentration to low concentration (down a concentration gradient). This occurs because the particles move randomly, and eventually end up ev...

A concentration gradient occurs when you have a solute, like salt, dissolved in a solution, like water. Most of the time there won't be the same amount of salt through out all of the water - there will...

For this answer, like with any other essay question, I encourage my students to draft an essay plan prior to writing. By doing so, my students show me their strengths and weaknesses which allows me to ...

If both parents are heterozygous (xX) and the blue allele (x) is recessive to the dominant brown allele (X), the offpring has a 1/4 chance of getting homozygous recessive alleles (xx).

If...