Help with these two questions please

What would be an example of hypothesis for goldfish respiration lab

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids