'Favourable variations' diaporamas de présentation

Science 20 Unit D: Living Systems

Science 20 Unit D: Living Systems. Developing a theory of Evolution. Scientific Theory. Scientific theories develop over time They are formed from many observations, experiments, and models Theories may change over time as new information is gathered.

405 views • 32 slides

Evolution and Variation Between Species

437 views • 22 slides

5.3 Populations

5.3 Populations. 5.3.1 Outline how population size is affected by natality , immigration, mortality and emigration. Factors that increase population size : Natality is recruitment to a population through reproduction Immigration from external populations e.g. Bird migration

238 views • 10 slides

Chapter 5: Population

320 views • 8 slides

2 0 0 7.

72 views • 1 slides