Difference between hydra, sponge and obelia

Which statement about inheritance is true? o girls get most of their traits from their moms, boys get most of their traits from their dads. o male offspring will always have an x-linked genetic disease if the mom is a carrier o fathers always determine the gender of the offspring in humans. o males never have y chromosomes.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic