Movement of phloem sap from a source to a sink
-occurs through the apoplast of sieve-tube elements.
-depends on tension, or negative pressure potential.
-results mainly from diffusion.
-depends on pumping water into sieve tubes at the source.
-depends ultimately on the activity of proton pumps-

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos

How do disease caused by bacteria and disease caused by viruses react to antibiotics?

Which of the following terms describes all of the non-living components of an ecosystem