What happens first when a star begins to run out of fuel? The star’s core shrinks. The star becomes a black hole. The star becomes a white dwarf. The star’s outer layer drifts away.

Which codon is the code for the amino acid histidine (his)?

When elements that form a mineral dissolve in hot water, they form a mixture called a(n) a)geode b)vein c)evaporation d)crystallization e)magma f)lava g)solution h)gem

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2