Lecture 1-1The science of life

Autumn in Colorado

A biologist: Poses and answers

questions about the natural world.

Studies the interactions of living things and the environment.

Studies organisms from a cell to the biosphere.

The world of biology

Biology and society

Polio vaccinations: Pakistan

Other concerns of biologists:

Pollution Disease prevention

and cures Improving our food

supply

Children with polio

What are the characteristics of living things?

Living things are all madefrom cells.Cells can form tissues.Tissues build organs.Groups of organs build organ systems.All together organism.

Organization and cells

Response to stimuli

Living things respond to their external and internal environments.

Light changes Hunger Pain Threat Survival

Organisms have regulatory systems that keep their ‘insides’ from changing.

Ex: sweating Shivering Wilting (plants)

Homeostasis

Feliz Sudor

Metabolism Living things all use energy to carry outtheir life processes.Plants get energy from ?Herbivores?Carnivores?Omnivores?

Life increases in size Growth happens when cells divide Development is change as the organism matures.

Growth and development

Since all things die, reproduction carries life into the next generation.

DNA carries genetic informationfrom one generation to thenext.

Reproduction

Evolution: change over time

Plant evolution

Horse evolution

Redwood forestPhoto by Grant Collier