Which is a major drawback to the use of hydrogen power? O A. Burning hydrogen releases greenhouse gases.
O B. Hydrogen power creates toxic waste that must be stored forever.
O C. The use of fossil fuels is required to create pure hydrogen.
O D. Hydrogen may run out in the next 100 years.

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

Why do farmers in different regions use different farming techniques

Choose the false statement. a. some organisms fossilize when frozen or dried out. b. bacteria can destroy dead plants and animals. c. it is common for a plant or animal to fossilize when it dies. d. rapid burial under small-sized sediment increases the chance for fossilization to occur.