Which of the following correctly describes the 3rd stage of the cardiac cycle? A. The ventricles contract.
B. The atria contract.
C. The ventricles are relaxed and fill with blood.
D. The atria relax while the ventricles contract.

The variables for this experiment include the number of each type of sprout, the average height of those sprouts, and the amount of compost given to each plot of land.use the drop-down menus to complete the sentences and identify the independent and dependent variables. the independent variable, the one that you intentionally manipulate, is the the dependent variables, the ones that you measure the response in, are

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

As , plants meet their needs for making food from air, soil, water, and the sun's energy in a process called there are plants called grow high in trees without here are words to put in the blanks. 1.) producers 2.) consumers 3.) chloroplasts 4.) epiphytes