Select all that apply. Chromosomes .

Are rod shaped structures that contain DNA

Are located in the nucleus

Occur in numbers that are the same for all members of certain species

Occur in numbers that are the same for all organisms

Are organized into karyotypes for scientists to analyze

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

How is mitosis different in plants and animals? a. in animals, the cell membrane pinches together. b. in plants, the dna is one circular chromosomes. c. in plants, there are no sister chromatids. d. in animals, a new cell wall forms.

How does deforestation affect the water cycle? a. it increases the amount of runoff b. it increases the amount of percolation c. it increases the amount of transpiration d. it increases the amount of precipitationa it increases the amount of runoff