If a woman with type A blood and a man with type O blood have children and all of those have type A blood , what are the genotypes of both of the parents?

Astudent conducts an experiment to determine how the amount of water given to a plant affects it growth what is the dependent variable for this experiment

What does it mean for a cell membrane to be selectively permable

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes