I need to check my answers, thanks! 1 New fossils are constantly being discovered and new stories about Earth’s history are emerging. The millions of fossils scientists have collected are documented in the Fossil
library
architecture
registration*****
database
2 Scientists use fossils that have been found and compare homologous structures, residual structures and DNA sequences among different organisms. From these comparisons, scientists learned that species with similar developmental patterns and body structures had one thing in common.
environment
predator
embarrassed***
ancestor (if they were ancestors they would use their structures the same, like a whale and a cat have a similar structure but use their bones/structure differently)
3 If you have a bacterial infection, your doctor may prescribe an antibiotic to kill the infection. However, over time, some antibiotics are no longer effective at killing the bacteria they once killed. How does the theory of evolution explain this?
The antibiotic has mutated into an ineffective form.
The antibiotic mutated the bacteria, allowing resistance to develop.
Individual bacteria acquired the ability to resist the antibiotic and passed the resistance on to offspring.
Genetic variation in bacteria has allowed some bacteria to have resistance to the antibiotic. They survived, reproduced and passed on resistance to offspring.******
4 Fossilized animal feces () is an example of what type of fossil
sunken fossil
body fossil
trace fossil****
fossil mold
5 The fossil record is incomplete and does not contain all of Earth’s past organisms. Why were some organisms discovered as fossils while others were not?
Fossils only exist for organisms that had hard shells or outer coverings. *****
Most organisms die and decay without leaving any fossil remains.
Fossils only exist for organisms that lived more than 3 million years ago.
Only very large organisms have sufficient body mass to cause the formation of fossils.
6 How does natural selection lead to the evolution of a species?
Environmental conditions reduce competition for resources within a species.
Environmental changes favor weaker members of the species.
Overproduction provides food for the strongest members of the species.
Advantageous traits stack among surviving members of the species****** at number 1)
5) Most organisms die and decay without leaving any fossil remains.
Others are ok.