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A change in the environment occurs. Through random mutations already present in the population (this is known as natural variation) certain individuals will be able to cope with the change more so than other...

The key fact here is to remember the relationship between the gradients of lines which are parallel and perpendicular. Two lines that are parallel will always have the same gradient. So if we have a line y =...

The nerve impulse starts at the dendrites, branch like structures,They then travel to the dendrons which make up the length of the neurone between the dendrites and the cell body.The cell body controls the w...

First, we model the child as a single point particle. Then, we add in arrows representing vectors for the relevant forces: friction, weight and the contact force. We can also assume that the child has reache...

When it is too cold the hypothalamus in the brain detects it is too cold it sends nerve impulses or electrical signals through the nervous system to targeted areas:erector muscles (don't laugh): are constric...