Question

which events contributed to life evolving on earth? check all that apply.organisms began to photosynthesize.the surface cooled, and water condensed.volcanoes added carbon dioxide to the atmosphere.ozone formed and blocked ultraviolet rays from the sun.comets crashed into earth, releasing water.

Explanation:

• Organisms began to photosynthesize: This process produced oxygen, which was crucial for the evolution of aerobic life forms.
• The surface cooled, and water condensed: Water is essential for life as we know it. It provided a medium for chemical reactions and a habitat for early organisms.
• Ozone formed and blocked ultraviolet rays from the Sun: Ultraviolet radiation is harmful to living organisms. The ozone layer protected early life from excessive UV damage.
• Comets crashed into Earth, releasing water: Comets may have delivered water to Earth, which was important for the development of life.

Volcanoes adding carbon dioxide to the atmosphere mainly contributed to the greenhouse effect and climate regulation. While it had an impact on the Earth's environment, it was not as directly related to the evolution of life as the other factors mentioned.

Answer:

Organisms began to photosynthesize, The surface cooled, and water condensed, Ozone formed and blocked ultraviolet rays from the Sun, Comets crashed into Earth, releasing water.