Scientists believe green algae to be the ancestors of land plants. The classification division separating algae from the kingdom Plantae began with fossil evidence. To be successful land plants require certain modifications. This early Devonian land plant had both vascular tissue and, as seen here,

The question is incomplete as it does not have the options which are:

A) roots. B) spores. C) seed pods. D) chlorophyll.

A) roots

Explanation:

The vascular plants are evolved from the Bryophytes which are evolved from the algae.

The algae are non-vascular plants and Bryophytes too. The vascular plants developed the vascular tissue to transport the absorbed water and nutrients from the terrestrial surface.

The plants living during the Devonian period possessed the vascular tissue to transport the nutrients but to absorb the nutrients and water, they also possessed the roots.

Thus, Option-A is the correct answer.

the correct answer is:

a population changes in response to a change in the environment.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.