Answer:
First question answer is the Northwest region was suitable for growing lush forests, especially cedar wood. So wood was readily available for the Northwest Indians to make totem poles and baskets.
Second question answer is there is a difference between the art forms of the Plains Indians and the Southwest Indians because of the materials available in their geographic locations are different.
Third question answer is art that men traditionally created are rock-carvings, pipes, and paintings. Pueblo men made kachina dolls. Pomo women of the Northwest made baskets. In the Southwest, Navajo women wove blankets and Pueblo women made pottery. Women in the Plains did needlework, beadwork, quillwork, and clothing designs. Northeast women created beadwork designs on moccasins and clothing using birch bark stencils. Seminole women of the Southeast created patchwork fabrics.
Fourth question answer is the Native American Graves Protection and Repatriation Act of 1990 established to return artifacts, including human remains and ritual objects from graves, to the American Indian tribes because they are culturally significant.