What do scientists call a gavitationally bound system of two stars in which both stars can be seen with a telescope?

How does using straws hurt the sea turtles?

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.

Could someone me with number one you