Which organ system makes blood?
a. digestive system
b. skeletal system
c. circulatory system
d. nervous system user: if you see a multicellular organism whose cell walls lack cellulose, it belongs to which kingdom?
a. archaebacteria
b. plantae
c. fungi
d. animalia

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land