What is a type of fossil from an organism that lived for a short time that is widely distributed, is easy to recognize, and assists with relative dating? A.
Intrusion
B.
Index Fossil

Pls help

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes