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Due to natural variation due to mutations in their DNA, some giraffes in the population had longer necks. These longer necks enabled them to reach leaves higher up on the trees, which secured them a good ...

Bile is made in the liver and stored in the gall bladder. Bile emulsifies fatty acids and lipids, breaking large chains into smaller droplets. This increases the surface area for enzymes (lipase) to act o...

The movement of molecules against their concentration gradient (low concentration to high concentration), across a membrane using energy.

The chromosomes condense and the nuclear membrane breaks down and the nucleolus disappears.

The electrical signal arrives at the first neuron. Neurotransmitters are released into cleft.They diffuse across the cleft and bind to receptors on the 2nd neuron.Electrical impulse is generated in second...