True or false

Most of a cell is the nucleus

Only the nucleus of a cell is the nucleus

the cell membrane has holes

Most cells must have a nucleus to live

Every cell has a cytoplasm

Observing animal tracks is an example of observation, which is used to estimate population size. A. mark and recapture B. indirect C. sampling D. direct

Describe the niche of a giraffe

What type of plankton is the major portion of the baleen whale's diet?

What are the thin fibers of the human nervous system that send messages between different parts of the body? A. ligaments B. tendons C. nerves D. spinal cord

The frogs heart is different than the human heart - describe the differences you saw

What results when the combined effect of two different drugs taken together exceeds the sum of the individual drugs administered alone?

Animal lays eggs with a tough leathery watertight shell

Why is DNA antiparallel? It has double strands complementing each other. The bases in one strand pair with the other bases in the complementary strand. It has a ladder shape. Its double strands run in opposite directions.

Which of these is a solution, where the solute and solvent are in the gas phase? A) air B) ozone C) brass D) carbon dioxide

The roads in northern states (like Michigan) need to be repaired more often than roads in southern states (like South Carolina). Explain the effects mechanical weathering could have on this?