Viruses cannot reproduce on their own and require a host organism to do it for them. This is one reason viruses are not considered to be alive. true or false

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

What do lava flows made of aa indicate about the type of volcanic eruption that occurred? a. the eruption was viscous. b. the eruption was pyroclastic. c. the eruption was explosive. d. the eruption was quite. !

How does the nervous system affect the excretory system?