When do the respiratory and circulatory systems work together? A. To supply nutrients
B. To fight infections
C. To promote digestion
D. To stop bleeding

Which hotel do you think is most likely to move ahead in market competition? a. a hotel that provides basic amenitiesb.a hotel that provides luxurious amenitiesc.a hotel that shows understanding of customers' latent needsd.a hotel that gives discounts

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Are gametes exactly the same? explain why or why not?