Are the changes caused by wind erosion of land in the high plains all due to human activity ? why or why not

No, why not? because the high plains is a relatively level high plateau, separated from the Rolling Plains by the Cap rock Escarpment. Elevations range from 3,000 to 4,500 feet above sea level.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.  

silty loam

hope this