Similarities and Differences Among Organisms. Mrs. Faulkner. Millions of species live on Earth, and scientists have identified and described many, but not all of these. All living things share features that are alike and there are also differences. Structure.
All species change themselves and adapt to change around them over time. Organisms develop adaptations and behavior that increase their survival. We know this because of the changes that we see in fossil records.
Organisms display significant differences in the ways they grown and develop. For example, some organisms hatch from eggs, and other organisms are born alive.