Can someone help me plzzz!

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.

Astudy was conducted to determine the proportion of people who dream in black and white instead of color. among 306 people over the age of 55, 68 dream in black and white, and among 298 people under 25, 13 dream in black and white ( based on data from do we dream in color) we want to use a 0.01 significance level to test the claim that the proportion of people over 55 who dream in black and white is greater than the proportion of those under 25.

Which of the following statement is true a.wast isn't a problem in reaching group goals. b.sacrifice isn't necessary to achieve group goals. c.individual productivity is necessary for group productivity.d.individual productivity is more important than group productivity.