According to cell theory, all cells carry out the functions needed to sustain life. That means all cells must contain A) DNA. B) a nucleus. C) cell walls. D) a control center.

Every organism that might sink to deep water is a plant or an animal. a. Trueb. False

What type of stress occurs when one plate pushes against another? compression faulting shearing tension

What type of joints are located in the backbone and the wrist?

In flowering plants, plasmodesmata are narrow channels through cell walls that connect the cytoplasms of adjacent cells.

What event signals the birth of a star?

Sex-linked traits are found on which chromosome?

Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to

What effect on the evolution of mammals was caused when the continents drifted apart?

What does the bacterial cell, human cell and plant cell have in common?

Which of the following correctly identifies the purpose of the ribosomes? A: Ribosomes are responsible for the cell division B: Ribosomes contain all the genetic material found in the cell C: Ribosomes are where most proteins are constructed in the