How can you relate the structures
to those of bryophytes in terms of evolutionary trend

Because ferns and fern allies posses true vascular tissues, they can grow to be much larger and thicker than the bryophytes.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds