Hurry this is really ! which of these describes something that would increase the validity of an experiment? a. having no dependent variables b. having a single experimental groupc. having other scientists repeat your results d. having to enter your experiment in a science fair

Which of the following is not a way in which a vascular plant's xylem and phloem are similar?

The intervention of extraterrestrials has been used to explain the bermuda triangle, a region of the atlantic ocean where ships and planes are frequently lost, leaving no evidence behind. how would this explanation best be characterized?

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.