Because this element is the basis of organic substances, its unstable isotope, can be used to find the age of organic material found in fossils.

1. mendel observed that pea plants had traits, such as color, that were either “one or the other,” never something in between. discuss the correlation between mendel’s factors, what they might be, and why pea plant traits come in one form or another—e.g., gray or dark red—rather than blended.