Chapter 6 - Science | Take the Quiz

What is a fossil?

Remains of life from an earlier time

Remains of life from an older time

More accurate, measures radioactive decay in igneous rocks.

Relative Dating

Absolute Dating

Geologic Time Scale

What type of fossils are there?

Molds & Casts

Trace

True

False

Comparing layers of sedimentary rock (top=younger, bottom=older).

Relative Dating

Absolute Dating

Geologic Time Scale

Organizes Earth's history in 3 major Eras.

Relative Dating

Absolute Dating

Geologic Time Scale

A gradual change in hereditary features over _____.

What did Charles Darwin discover?

Theory of evolution by natural selection

Galapagos Islands (finches, tortoises, iguanas)

Fossils

Body parts of organisms that are similar in structure and position (ex. Bone arrangements) but differ in function

Homologous Structures

Analogous Structures

Vestigial Structures

Body parts that preform a similiar function but differ in structure (not evidence of a close common ancestor)

Homologous Structures

Analogous Structures

Vestigial Structures

Body parts that have lost their original function through evolution

Homologous Structures

Analogous Structures

Vestigial Structures

Developmental Biology

Embryology (study how embryos develop before birth)

Phargeneal pouches (all vertebrate embryos have one at one stage of development, ex. fish > gills)

DNA

Molecular Biology

Comparing DNA sequences to see how closely related organisms are

Organisms that are more similar would have similar genes and proteins

Analyzing DNA can be the most useful for organisms that are distantly related

Embryology

Chapter 6 - Science