question 20 of 50\nscientists measure radioactive elements in rocks to determine the age of the…

question 20 of 50\nscientists measure radioactive elements in rocks to determine the age of the rock.\ntrue\nfalse\nquestion 21 of 50\nincreases in oxygen gas in the earths atmosphere led to\nglobal warming.\nextinction of the dinosaurs.\nthe origin of unicellular organisms.\nmore anaerobic organisms\nmore aerobic organisms.\nquestion 22 of 50\nan endoskeleton is a type of skeleton that is found inside of the animals body.\ntrue\nfalse\nquestion 23 of 50\nthe presence of microtektites and shock quartz at a site in the earth are evidence of\nthe cambrian explosion.\nadaptive radiation.\na meteor impact.\nmass extinction.\nsedentary lifestyles.

question 20 of 50\nscientists measure radioactive elements in rocks to determine the age of the rock.\ntrue\nfalse\nquestion 21 of 50\nincreases in oxygen gas in the earths atmosphere led to\nglobal warming.\nextinction of the dinosaurs.\nthe origin of unicellular organisms.\nmore anaerobic organisms\nmore aerobic organisms.\nquestion 22 of 50\nan endoskeleton is a type of skeleton that is found inside of the animals body.\ntrue\nfalse\nquestion 23 of 50\nthe presence of microtektites and shock quartz at a site in the earth are evidence of\nthe cambrian explosion.\nadaptive radiation.\na meteor impact.\nmass extinction.\nsedentary lifestyles.

Answer

Brief Explanations:

  • Question 20: Radiometric dating measures radioactive elements in rocks to find their age.
  • Question 21: Oxygen - rich atmosphere favored aerobic organisms.
  • Question 22: Endoskeleton is inside the animal's body.
  • Question 23: Microtektites and shock - quartz are evidence of meteor impacts.

Answer:

  • Question 20: True
  • Question 21: more aerobic organisms
  • Question 22: True
  • Question 23: a meteor impact