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Membrane less permeable to sodium ions Sodium ions actively transported out... ...(by) sodium ion carriers inside of the membrane is negative compared to the outside / 3Na+ out and 2K+ in Must talk about Sod...

For fertilisation to occur, the pollen (male gamete) of a flower must come in contact with the ovule (female gamete), which is contained within the pistil, of another flower. A pollinator (insect such as a b...

Thermoregulatory homeostasis helps to maintain the core body temperature at 37 degrees Celsius.When we are too hot the body's sweat glands secrete sweat onto the skin which then evaporates, allowing us to co...

There is natural variation in the lengths of giraffes' necks. As there will be competition for food with other giraffes and other species, those with longer necks would reach leaves on the trees which others...

In a vaccination there are small quantities of a dead or inactive version of the pathogen .When you inject it into the individual's body an immune response is stimulated against the ' foreign body '. The whi...