Genetic variation<span> occurs </span>mainly<span> through DNA mutation, gene flow (movement of genes from one population to another) and sexual reproduction</span>
Answer:
1) All living things are made up of cells.
2) Cells are the building blocks/smallest unit of life.
3) All cells come from preexisting cells (cell division).
Explanation:
Severe low back pain and bruising along his flank
Answer:
Ecological and ethological approaches to the study of behaviour. The natural history approach of Darwin and his predecessors gradually evolved into the twin sciences of animal ecology, the study of the interactions between an animal and its environment, and ethology, the biological study of animal behaviour.
