What is life Flashcards
What are living things?
Order, the need for energy, growth and development, regulation of one’s internal environment, the ability to reproduce, the ability to response to one’s external environment, and evolutionary adaptation
Adaptations
Adaptations are traits that help an organism survive in its current environment
All life is related and can be traced back to a common ancestor that existed approximately?
3.7 billion years ago
Paleozoic Era
Pre-cambrian–>Crambrian–>Ordovian–>Silurian–>Devonian–>Carboniferous–>Permian
Mesozoic Era
Triassic–>Jurassic–>Cretaceous
What is natural selection?
A process by which a population becomes better adapted to its’ environment over time (a more succinct definition of natural selection is “differential reproduction”- the best adapted individuals are more likely to reproduce than les well adapted individuals)
What is life?
- Ability to reproduce
- Ability to grow
- Metabolism
- Homeostasis (stable equilibrium)
- Respond to stimuli
Evolution
a change in the genetic structure of a population over time
Pheomelanin
Eumelanin
yellow to brown hair color
gray to black hair color
Life can ONLY be defined as ______
there is no single definition for life
Which of the following statements about natural selection is most accurate?
Natural selection can only act on populations with genetic variation.
