Ques:Q: What instrument made it possible to study pressure quantitatively? Choices: - anemometer - seismograph - thermometer - barometer A:

Ans:barometer
-----
Ques:Q: What do you call a close relationship between two species that benefits both? Choices: - commensalism - primordial relationship - parasitic relationship - symbiotic relationship A:

Ans:symbiotic relationship
-----
Ques:Q: What are the outer-shell electrons of an atom called? Choices: - outer electrons - organism electrons - helium electrons - valence electrons A:

Ans:valence electrons
-----
Ques:Q: How many types of major tissues do modern plants have? Choices: - two - seven - four - three A:

Ans:
three
-----