Use the drop-down menus to answer the questions. Which fossil is the oldest? ammonite, crinoid, trilobite

Crinoids

Explanation:

Crinoids are 300 million years old, Ammonite is only 200 million, and Trilobite is just 250 million years old

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.