Which of these protists is believed to have evolved following a secondary endosymbiosis?
green algae
cyanobacteria
red algae
chlorarachniophytes

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary

How far away is the nearest black hole from earth?

Does all the energy stored by the phytoplankton reach the top level of the pyramid