grade 8 life science

what are the orders of life and largest smallest?

Biosphere ecosystem Community population organism organ system organ tissue cell

in order to be a living thing, what are six things in organism must have

Made of cells, reproduction, growth, and development obtain and use energy respond to environment homostasis

why is genetic variation important for species? Survival

ensures adverse pod of traits within a single population

what is an example of biography?

Marsh piles are unique to Australia

what is an example of embryology?

gill slits

what is an example of morphology?

Forelimbs of humans, whales, cats, and bats

what is an example of DNA?

9899% of DNA includes similarity

similar structures and non-closely related species

Analogo structures

an organism made of more than one cell

Multicellular

Gene that help organism survive in a particular environment are passed on offspring

natural selection

A group of organisms that can be interbreed with one another and produced fertile offspring

Species

The number of offspring produced in an individual

Fitness

an organism that is made of only one cell

unicellular

characteristics that an organism inheritance that helps it survive and reproduce

Adaptation

an organism that must obtain food from other organisms

heterotroph

genetic changes occur in a population overtime

Evolution

an organism state of steady, balanced internal conditions

Homeostasis

structure about an organism inherited from ancestor and no longer uses

vestigial structures

similar structures and different species due to inheritance from common ancestor

homologous structures

species that share a common ancestor

common descent

find age of fossils using the half-life of radioactive isotopes

radioactive dating

find the age of fossil using its position in the ground

relative dating