What are the five examples of early warning systems that used by government?

Which of these is a disadvantage of hydrogen fuel cells? a. engines that use hydrogen fuel are more efficient than gasoline-powered engines. b. the only emission produced by hydrogen fuel cells is water. c. hydrogen fuel is continually available and useful for heating. d. hydrogen fuel is often purified in a process that emits lots of greenhouse gases.

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Territorial insects like spiders that fight off intruders would be expected to be a) regularly distributed b) randomly distributed c) clustered together d) b and c e) selectively distributed