What makes the core of the Earth denser than the mantle? a. because the mantle isn't as hot as the core

b. because the core is under much more pressure causing more density

c. because the core is metallic iron and nickel which are denser than the materials than in the mantle

d. because the inner core is solid, and the mantle is semi-solid

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.