In the evolutionary history of plants, the Carboniferous period is the period when the earliest known plants existed.

the period when the earliest known vascular plants existed.

a time period when dense forests of seedless vascular plants existed.

a time period when diverse species of gingkoes flourished.

the period when angiosperms diversified.

Differences between compact bone and cartilage

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.