reasons for variety Flashcards
explain how deep-sea hydrothermal vent organisms are adapted
no eyes
sense organs that detect dangerously high temperatures
acidic water, at high pressure and full of minerals: soft parts strengthened by iron scales
haemoglobin to help take oxygen from water.
explain how polar organisms are adapted
white fur for camouflage
thick fur, extra fat below skin, bulky body, small ears
wide feet with rough soles to help grip the ice
what is discontinues variation
characteristics controlled by genes e.g. blood group and gender
what is a acquired characteristic
a characteristic that is changed by the environment
what is continuous variation
it is where a characteristic varies gradually and continuously between extremes. e.g. height and weight
what is a normal distribution curve
it is a bell shape showing that the most common variation lies between two extremes, with fewer individuals having variations that are near to each extreme.
