What two instruments made navigation much easier in the 1900s?

global positioning satellite (gps) and two-way radio
the chronometer and the astrolab
the cross-staff and the compass.
the chronometer and the compass.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Toorale man murder mystery < - your lab link 1. how was the toorale man found? 2. what did archaeologists learn about the burial? why is the burial important? 3. what information were the scientists able to learn from the skeleton itself? 4. why is the question of whether the injuries came from a stone or steel weapon important? how could scientists distinguish between the different types of weapons? 5. what did the carbon dating and soil testing tell scientists about toorale man? why are the dates interesting for scientists?

In the presence of oxygen, glycolysis is followed a. the krebs cycle b. lactic acid fermentation c. alcoholic fermentation d. photosynthesis