Structures called microtubules are found
in the cytoplasm of most eukaryotic
cells. microtubules are made up of
proteins and shape and support
the cell.
which of the following elements are
most abundant in microtubules?
a. lead and zinc
b. nitrogen and carbon
c. sodium and chlorine
d. iodine and magnesium

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

What’s the student’s scientific question

During convection, less dense fluid rises and denser fluid sinks.