Question

question 22
plant and animal life faced many challenges when moving from water to land.
select the false statement about this transition.
the oxygen levels in the atmosphere were not high enough to sustain life on land.
organisms on land could dry out unless they found a water source.
the movements of organisms changed without water for transport.
the development of an ozone layer protected organisms from solar radiation.

Explanation:

1. Oxygen levels in the atmosphere eventually became sufficient to support life on land. Early land - dwelling organisms evolved to utilize the available oxygen.
2. On land, without the constant presence of water as in aquatic environments, organisms were at risk of desiccation (drying out) if they didn't have access to water sources or adaptations to prevent water loss.
3. In water, organisms can use water currents for movement or have streamlined bodies for swimming. On land, movement mechanisms changed, such as the evolution of legs for walking or crawling.
4. The ozone layer, formed from oxygen in the atmosphere, absorbs harmful ultraviolet solar radiation, protecting organisms from its damaging effects.

Answer:

The oxygen levels in the atmosphere were not high enough to sustain life on land.