What is a polar vortex? *
A) The atmospheric effect of everyone in a region opening their freezers at once
B) A constant ice storm that only affects certain regions
C) Low-pressure zones at each pole of the earth

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

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

Where is pericardial fulid located