Sensitivity

To avoid danger and to find the best conditions for life, living things must be able to detect changes in their surroundings and react to them. This is sensitivity.

Animals usually react quickly because they have sense organs (such as eyes) to receive information, and nervous systems to carry information.

Plants react more slowly, growing, for example, toward a stimulus such as light. Light, sounds, chemicals, touch, and temperature changes are all examples of stimuli

5. Read the text and find equivalents to the Russian words:

Потомство, передавать, хромосомы.

Reproduction

All living things eventually die. In order to prevent whole groups of organisms from dying out, living things must produce young that are like themselves.

This process is called reproduction. In most species two parents are needed to produce offspring, whereas in some species only one parent is needed. During reproduction the parents pass on information about how their offspring will look and develop. This information is carried and passed on through the chromosomes.

Read the text and say what are herbivores, carnivores and omnivores.

Nutrition

The way that organisms get their food is called nutrition. Food provides the building materials for growth and repair,as well as energy for all the organism's life activities. The ultimate source of energy is the sun. Plants use the energy in sunlight to make their own food. Organisms that cannot make their own food must feed on others. Herbivores eat plants, carnivores eat animals, and omnivores eat both.

Read the text and say if the statements are true or false; correct false sentences.