How are ecosystems named? a. by the climate it is associated with b. by the plants that inhabit the ecosystem c. by the surrounding city that is close by d. by the surrounding country that is close by

a, a knight

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.