Darwin originally defined evolution as ( concept 19.1)

Here is the answer that would best complete the given statement above. Charles Darwin originally defined evolution as descent with modification. Charles Darwin is known to be the father of evolution. Hope this answers your question. Have a great day ahead!

An egg, or a sack of flour

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.