The horizontal rows<span> in the </span>periodic table<span> are periods, while the vertical </span>rows<span> are </span>called<span> groups. </span>
Answer:
The main effect of the earth is seasons.
Explanation:
Our earth is tilted at the axis of 23.5° (relative to our orbital plane – the plane of Earth's orbit around the sun. ) and this tilted axis is causing seasonal change at our planet.
Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis
I would say the answer is D.