The first land plants occurred in the Ordovician. What important function did they contribute to conditions on land that allowed for an explosion of life on land during subsequent geologic periods? (Hint: Why are land plants important to live on Earth in the present day?)

Explanation:

Land plants are one of the major support of life. Oxygen gases given as a waste product from plant is what human takes in as air to support life. Lands plant provides the major food we eat, which without men cannot survive.

Most medicines, herbs used in various ailment treatment are from land plant this makes them of immense important on the planet earth.

They help in maintaining the ecosystem by reducing the effect of global warming while making use of abundant carbon dioxide that is available in the atmosphere.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

the answer is b.) hydrogen bonds between bases.