How long ago do scientists believe the continents formed Pangaea?

about 135 million years ago

about 180 million years ago

about 300 million years ago

about 4.5 billion years ago

What is the difference between the rough and smooth endoplasmic reticulum

Jimmy and Jenny have designed an experiment to test how termites react to the chemicals in ink pens. They use one termite in their experiment. Jenny draws four circles, using four different brands of black ink.

The coarse and fine focus knobs adjust the distance between a. the objective and ocular lenses. b. the ocular lenses. c. the ocular lenses and your eyes. d. the stage and the condenser lens. e. the stage and the objective lens.

The enzymes involved in dna replication, do it with extreme fidelity. the error rate is approximately 1 in every 100,000 nucleotide base pairings. when dna replication, however, is complete the number in correct pairing is considerably much lower.

Which two political parties participated in the Election of 1828?

What is the purpose of engineering the citrus tristeza virus?

Researchers use experiments rather than other research methods in order to distinguish between

4. Shows each line represented as a pair of shared electrons but is not truly three-dimensional: 5. Shows three dimensions but no interior bonds: 6. Is used in kits and shows a general shape:

Which statement best describes an independent variable? A-The variable that responds to change in a investigation B - The variable you can change in an investigation C - The effect in a cause/effect relationship D - The factor that can never change

How did the citizens of Rome republic govern themselves