Which gland secretes thyroxine? a. hypothalamus b. pituitary gland c. thyroid gland d. adrenal gland

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?