Which is an abiotic component of a marine ecosystem?
a) coral reef
b) detritus on the bottom of the ocean
c) fish in the water column
d) sand on the ocean floor

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?

What causes mountain ranges to form

Imagine that the value of the us dollar rises compared to the canadian dollar for many months. what effect is this likely to have on the amount of goods the us imports from canada?