Dale makes a model of part of an elemental solid by attaching balls to each other with rods. his model looks something like the following image:

how could dale improve his mode

a.

by using springs instead of rods to allow the model atoms to vibrate in their positions

b.

by using strings instead of rods to allow the model atoms to move more freely

c.

by using different sizes of balls to represent different kinds of atoms

d.

by using cotton balls instead of hard balls to allow the model atoms to change size

Which of the following systems in absorbing oxygen and releases carbon dioxide

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.