... on a symbiont relationship with another prokaryote. The aerobic prokaryote was enclosed by the bacterium's cell surface membrane in the process of endocytosis, which is made easy by the absence of a cell wall in the bacterium. The aerobic prokaryote wasn't digested but continued to function inside the other cell. The host cell received energy that the aerobic prokaryote released. The mitochondrion that was forming had everything ... He also observed that high birthrates and a shortage of life's necessities forced organisms into a constant "struggle for existence," both against the enviro...

• Word Count: 2685
• Approx Pages: 11
• Has Bibliography
• Grade Level: High School

... Darwin in 1859, stated that all plant and animal life evolved over long periods of time from simple to more complicated forms through mutation and adaptation. He also taught that only the fittest of each species would survive. He further postulated that the first living cell evolved in a "warm warm ... accept the alternative. Later, he attempted to find whether a single amino acid change in a hemoglobin mutation could be found that doesn't adversely affect the function of that hemoglobin. He was unable to find such an instance. He also explored the interactions between proteins, amino ac...

• Word Count: 2793
• Approx Pages: 11
• Has Bibliography
• Grade Level: High School