Considering that millions of species have lived on earth why are there relatively few fossils

What is the purpose of the cell organelles?

A geologist is studying rock layers in an old river bed, and he finds a fossil of a fish and a horsetail rush in the same rock layer.

You observe 4 cell samples under a microscope. Identify which one belongs to a plant. A. Sample 2 has mitochondria and chloroplasts, a cell wall and a large vacuole. B. Sample 3 has mitochondria and a nucleus but no cell wall. C.

In his observations of heterosexual strangers in bar situations, Perper found if people were mutually attracted to each other the first indication was what?

A segment of a DNA molecule contains the base sequence: TAC CCA GGT. Using the mRNA codon chart, which amino acid sequence would be produced from this DNA base sequence?

Which of the following is not a phase of gastric secretion? A. cephalic B. gastric C. intestinal D. enterogastric

How are biomes related to ecosystems?

What is the term for the flexible material that forms the structure of the ear? A. Cartilage B. Obliques C. Spongy tissue D. Osteoblast

Suppose you remove your test cultures from the incubator and notice that one of them-a known fermenter-has a gas bubble in the Durham tube. Knowing that fermenters frequently produce gas, you ignore the bubble and proceed to the next step.

In peas, yellow seed color (y) is dominant to green seed color (y). which describes an organism that has nonidentical alleles for seed color? yy and has green seeds yy and has yellow seeds yy and has yellow seeds yy and has green seeds