Stomata allows gas exchange throughout the leaf so your answer is carbon dioxide
: D
The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
True millions of different species live on coral reefs
Answer:
I believe it's c I could be wrong but I'm pretty sure
