This is a macromolecule that holds cell information in a coded form. made of sugar, phosphate and nitrogen-containing bases. example: dna and rna

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism