My finals are coming up, any tips in general?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

Identify the type of weathering seen in each picture ? chemical weathering mechanical weathering

Rectangle qrst is shown. angle qrt is congruent to angle str, and angle str is complementary to angle qtr. which statement is true about angles qrt and qtr? they are congruent. they are complementary. they are supplementary. they are right angle