Que condiciones debe tener una población para crecer en forma de J

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Im is in a crowd of people at the mall looking for his girlfriend tammy, who was supposed to meet him for dinner. jim realizes tammy is across the room as he catches a whiff of her overpowering perfume, 'paris #6'. which process explains why jim is able to smell the perfume?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell