Which cells are biconcave in shape and have no nucleus?

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water

What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome

This diagram shows how seed plants are grouped. which is the missing label? bryophytes angiosperms pteridophytes monocots