When a sea urchin egg is removed from the
ocean and placed in freshwater, the egg
swells and bursts. which of these causes
water to enter the egg?
a) coagulation
b) sodium pump
c) active transport
d) osmosis

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?

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not

Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus