The external coverings of diatoms are made up of (cellulose, silica, chitin) , while slime molds have cell walls containing (cellulose, silica, chitin). Diatoms are (chemoautotrophs, chemoheterotrophs, photoautotrophs) because they make food through photosynthesis, while slime molds are (autotrophs, heterotrophs, phototrophs) because they eat decaying plant matter.

Which statement best explains why cells were observed in more detail using a compound microscope than a simple microscope? a compound microscope has greater magnification ability than a simple microscope. the compound microscope was invented before the simple microscope. a compound microscope is much easier to manufacture than a simple microscope. compound microscopes were more common than simple microscopes.

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.

What is the chemical formula for dihydrogen monoxide?