theory of evolution
darwin theory
bio diversity and extinction
100
the diversity of life today and in the past can be explained by __________
evolution
100
darwin was a _____ a person who observes and studies that natural world.
naturalist
100
what are 2 factors that affect biodiversity in an ecosystem?
anyone of these 4: area, climate, genetic diversity, diversity of niches.
200
____ ____ also supports the theory that living things evolved from earlier organisms.
fossil evidence
200
about how many species have been identified on earth?
1.6 million
200
both the ____ _____ and the genes that differ among individuals make up the total shared gene pool of that species.
shared genes
300
the millions of fossils that scientists have collected are called that ___ ___
fossil record
300
recall that a _______ is the preserved remains or traces f an organism that lived in the past.
fossil
300
what is a role of an organism in its habitat or how it makes its living?
niche
400
scientists compare the sequence of _____ ____ in the DNA of different species to infer how closely related two species are.
nitrogen bases
400
darwin concluded that the finch species were all related to a single ______ species that came from the mainland.
ancestor
400
what usually occurs when a species is unable to adapt within a changing environment?
extinction
500
therefore scientists can also compare the order of _____ _____ in a portion to see how closely two species are related.
amino acids
500
darwin proposed that evolution occurs by means of what?
natural selection
500
what are the most diverse ecosystems in the world?
tropical rainforests
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