How is radioactive decay used to date sedimentary rocks? The amounts of potassium and argon in sedimentary rocks are measured.
The amounts of carbon-14 and nitrogen in sedimentary rocks are measured.
The amounts of unstable elements in each layer of the sedimentary rocks are compared.
The amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***

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