After reading the statement below, answer the questions that follow.
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.
◦ low; low
◦ high; high
◦ low; high
◦ high; low