Cell unit review extravaganza

How does oxygen move from the respiratory system to the circulatory system? a. by pumping through the heart b. by circulating in an artery c. by moving across a synapse d. by diffusion across a capillary wall

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

What organ systems are working to you cool down after a workout?