Jack is studying a few new leaf samples. the first leaf sample has a single leaf blade. the second had leaflets arising from a single petiole. the third sample has paired leaflets along a central rachis. him classify these leaves correctly.

a) all three are compound leaves.

b) the first sample is a simple leaf and the other two are compound leaves.

c) the first two samples are simple leaves and the third is a compound leaf.

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.

not sure if this is what you'r looking for prokaryotes have organelles hope this out at least.