Ch-11 Flashcards
Scientists infer evolutionary relationships by comparing the early development of
Organisms
The millions of fossils that scientists have collected are called the
Fossil record
Scientists infer that species with similar body structures and development patterns had a common
Ancestor
Change over time is know as the theory of
Evolution
Similar structures related species have inherited from a common ancestor are called
Homologous structures
Scientists compare the blank bases in the DNA of different species to infer how closely related the species are
Gene
In most cases evidence form DNA and blank has confirmed conclusions about evolutionary relationships based on fossils,embryos,and body structure
Protein structure
an organisms blank is it’s basic body plan
Body structure
Fishes amphibians reptiles birds and mammals all have an internel skeleton with an
Backbone
Scientists can compare the order of blank in a protein to see how closely related two species are
Amino acids
Darwin was amazed during his journey to find so much
Diversity
The different shapes of bird beaks are an example of
Adaption
Only the organisms with a desired charecteristics are bred in
Artificial selection
From the evidence he collected Darwin concludes that organisms on the Galápagos Islands
Changed over time
Today scientists know that organism are much blank diverse than Darwin imagined
More
In Darwin’s book blank he proposed that evolution occurs by mean of natural selection
The orgin of species
Without blank all the members of a species would have the same traits
Variation
To understand how evolution might occur Darwin studied the offspring of blank animals that were produced by artificial selection
Domesticated
Darwin made a number of important observations on the blank islands
Galápagos Islands
A new species can form when a group of individuals remain completely separated from the rest of its blank long enough to evolve different trailts that prevent reproduction
Species
A natural blank such as a river or volcano may separate group members
Barrier
The Kaibab squirrel and the aberts squirrel are members of blank species
The same
Factors that affect biodiversity in an ecosystem include area climate genetic diversity and blank
Diversity of niches
Blank explains how variations can lead to changes in a species
Natural selection
Occurs when some members of a species become cut off
Isolation
Species that could become endangered in the near future are called
Threatened species
The use of Florida land for framing and home building has reduced the amount of blank in which panthers could find food
Habitat
The Florida panthers are considered an blank species
Endangered
