By Erick Rodriguez and sherley Period 3 SC.912.L.15.1 By Erick Rodriguez and sherley Period 3

Differences between theories and laws A scientific theory summarizes a hypothesis or a group of them that have supported with repeated testing. And a law is a generalizes a body of observation . A law cant be described like Newton's Law of gravity you can use this law to predict the behavior of dropped objects. Unlike theories, theories can describe experiments.

Adaptive Radiation Adaptive radiation is a change in plants or animals due to environmental change. Or like moving to a new region and adapting to the new environment in order to survive. Like for example the change of a birds beak in order to get food and survive. Or like a moth that changed to a different color in order to blend for it can’t be attacked or eaten.

Homologous structures Homologous structures are similar body parts of two organisms that share a common ancestor. Even though there are two different organisms the body parts that are similar serve the same purpose. So from observing the parts that are similar scientists concurred they come from a common ancestor.

Vestigial organs Vestigial organs are organs that no longer has a useful function in an organism. These organs use to be useful for us and other animals in the past. So Darwin used this as prove that we have evolved and adapted to the change in the environment for us and animals.

Contributions of Darwin Charles Darwin contributions to science was evolution and that we all come from a common ancestor. Also the theory of evolution of animals and plants through natural selection. And he concluded that due to long-term environmental change like movement of land mass and climate change we adapted and evolved.

Development of the skull The skull develops from mesenchyme around the developing brain. The skull develop due to the increasing size of the brain the skull contains a large flexible fibrous joints, which is called suture. Which allows the head to compress and pass through the birth canal and then to expand for the brains growth.

Trends in Hominid Evolution The evolution of hominids is characterized by trends like: Ability to walk upright. Increase in brain size. Change in skull change Decrease in jaw size and angle in which jaw protrudes from face. Ability to make and use tools and communicate using language.

Human evolution

Homo erectus Larger brain Flatter face Taller Homo erectus and like fossils are found in Africa, Asia, and Europe and are dated between 1.6 million years ago to 200,000 years ago and they have: Larger brain Flatter face Taller Walked fully upright on 2 legs. Small groups Some language Made tools Used fire

Skull of Homo erectus A widely distributed species Whose remains have been found in Africa, Europe, India, China, and Indonesia

Homo sapiens By 40,000 years ago like modern humans. Sophisticated language skills. Complicated and useful tools. Created art Learned to grow crops

Homo Sapiens 100,000 yrs ago Art: Cave Paintings, Venuses Oldest paintings: Chauvet (32,000 yrs old) Lascaux (17,000 yrs old) Peche Merle (15,000 yrs old)

Comparative Anatomy Comparative Anatomy are Structural similarities link related species

Comparative Embryology Comparative embryology is the comparison of the development of embryos of two or more species.