Analogy/Homology

1.
a. Dolphins and blue whales both have teeth
b. dolphin mainly eat fish while blue whales eat plankton. dolphin teeth are rigid and hard while blue whale teeth are more like bristles. this difference is due to the differences in their diets.
c. protocetus also had teeth
d.

2.
a.Octopi and jellyfish both have tentacles
b.the tentacles of the both are used for aquireing food. however, octopi tentacles are covered with suckers while jellyfish tentacles are not. differences exist because octopi use tentacles and their mode of transportation and they also hunt stronger food. Tentacles are useful for obtaining food.
c.Bacteria, some bacteria have a small "feeler" called a flagella used to sense their surrounding and move.
d.

Secret Message

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Not Enough Food

http://www.ucmp.berkeley.edu/history/malthus.html
Thomas Malthus summarizes that populations are limited by the availability of resources. Darwin's idea that for evolution to occur individuals must compete for limited resources and only the most efficient at obtaining those resources will survive to produce offspring. If Darwin had not heard of this idea he may have come to the same conclusion by himself but if he hadn't, Darwin would not be able to explain why species develop in certain ways. Not only the church but the scientific community itself was mostly against Darwin's ideas and caused him to delay the publication of his book because of the social backlash.