In a closed circulatory system, oxygen and nutrients are exchanged directly between the cells and the environment. true or false

False. In an open circulatory system is when the cells are in direct contact with the environment. Take our bodies for example, we breath into our lungs and the blood carries oxygen to our cells and tokes the waste away from the cell making it a closed circulatory system

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

my teacher would say no s