The hormone responsible for the maturation of white blood cells known as T lymphocytes is: (a) thymosin
(b) aldosterone
(c) progesterone
(d) melatonin
(e) thyroxine

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

The model illustrates a process by which a substance is taken up by a cell