The introduction of Caulerpa, also known as killer algae, into California was ultimately the result of . a.
hull fouling
b.
the aquarium trade in exotic, nonnative aquatic species
c.
intentional release
d.
an algae farming company

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

How water is moving through the ecosystem ?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?