Describe how plants vasculature is optimized for water transport in the tallest trees

What are two reasons for why a species might disappear from the fossil record?

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.