Betty notices an acorn on the ground. She thinks it's a seed so she put it into a pot with soil and water. Eventually, she sees the plant growing upwards. she knows plants have cells and can do photosynthesis. Eventually, the tree grows and produces more acorns. What characteristics of life did Betty not directly observe over time?

A. The tree has leaves that eventually produce the acorns.

B. The trees use carbon dioxide during the photosynthesis to produce food

C. the tree maintains homeostasis inside its cells.

D. The tree produces more offsprings over time