Biology

Levels of organisation: An ecosystem is a community of living organisms (plants, animals and microbes) in relation with the non-living components of their environment (things like air, water and mineral soil), interacting as a system.

•Being fit can be defined as the ability of a body to cope with all the demands of its lifestyle. •Fitness is made up of four factors: 4 S-factors:

All living things make more of themselves by reproduction. Fertilization Fertilization is the fusion of the male and female cell nuclei to form a zygote. Adaptations of male and female gametes for fertilization Sperm cells have these adaptations: