1. Select the 2 correct statements that describe cyanobacteria.
A. Cyanobacteria lived in the ocean
B. Cyanobacteria decreased the level of oxygen in the atmosphere
C. Cyanobacteria were the first photosynthesizing organisms
D. Cyanobacteria have complex cells containing a nucleus
2. Select the correct terms to fill in the blanks
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to _____, which aided in the formation of _____.
The terms are:
Increase, remain constant, and decrease for the first blank. And for the second blank the terms are: chloroplasts, roots, and soil.
3. Which of the following factors made the land a place where the first land plants could thrive? Select the two correct answers.
A. new, nutrient-rich soil made of cyanobacteria and deteriorating rock
B. evolution of animals
C. low levels of oxygen in the atmosphere
D. abundant sunlight for photosynthesis
1. The two correct statements that describe cyanobacteria are:
C. Cyanobacteria were the first photosynthesizing organisms
A. Cyanobacteria lived in the ocean
2. The correct terms to fill in the blanks are:
Increase, soil
Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to increase, which aided in the formation of soil.
3. The two factors that made the land a place where the first land plants could thrive are:
A. new, nutrient-rich soil made of cyanobacteria and deteriorating rock
D. abundant sunlight for photosynthesis