Scientists found evidence of a fish that lived millions of years ago. The fish had features that
were possibly used to move on land. This fish is
now extinct.
What scientific evidence did the scientists most
likely find that confirmed the existence of this fish?
a fossil
B.
a description
C.
a photograph
D.
a cave drawing

The number at the end of an isotope’s name is the number.

An object displaces 652 ml of water. the volume of the object is: 0.652 cm³ 6.52 cm³ 65.2 cm³ 652 cm³

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.