1. To carry on the species, organisms must…………………………
2. If a species reproduces at a rate slower than the rate at which they die they may become……………………………….
3. ……………………………animals are those whose number is so small that there is a danger of their becoming extinct.
4. The male reproductive cell is called a……………………………..and the
Female reproductive cell is called an……………………………..
5. The process of fusion of a sperm and an egg is called……………………
6. In humans, the development of the fertilized egg takes place in the ……………………………………..
7. The study of……………………………………is called genetics.
8. Traits are passed on from parents to offspring by……………………..