Question

how does co2 enter the plant? through the guard cells through the stomata through the roots

Explanation:

Stomata are small openings on the surface of plant leaves (and some stems) surrounded by guard cells. Carbon dioxide (CO₂) enters the plant through these stomata, which open and close to regulate gas exchange. Guard cells control the opening of stomata but CO₂ doesn't enter through the guard cells themselves. Roots absorb water and minerals, not CO₂ for photosynthesis. So the correct option is the one stating "through the stomata".

Answer:

B. through the stomata (assuming the second option is labeled B; if the original labels were different, adjust accordingly, but based on the content, the correct choice is the option with "through the stomata")