Identify each event as the result of mechanical weathering or chemical weathering.
the minerals in a marble statue react
with water to form acids and pores in
the structure.
a piece of rock crumbles after being
constantly thrashed by strong waves
industrial runoff forms cracks in a
rocky structure in its path.
the rocks in a region are streaked
orange after being exposed to
repeated rains.

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

What came first egg or chicken? and is tomato a vegetable or a fruit?