A Leaf with a Higher Density of Stomata Can Take

A leaf with a higher density of stomata can take up more CO₂ and release more water than a leaf with a lower density of stomata.
-The stomata found on fossil plants can be a reliable way to measure past carbon dioxide levels. Normally, fossil plants with a high density of stomata indicate ________ carbon dioxide levels and fossil plants with only a few stomata indicate ________ carbon dioxide levels.

A) low; high
B) high; high
C) low; low
D) high; low