Examlex
For the first 2 billion years of its history, Earth's atmosphere lacked (or had very little) oxygen. Which of the following organisms produced much of the oxygen that now makes up the present-day atmosphere of Earth?
Maturation
The process of growth or development, often in the context of organisms or psychological development in research.
Diffusion
The process by which an innovation is communicated through certain channels over time among members of a social system.
Control
In experimental research, the standard by which test results are compared, often a group that does not receive the experimental treatment.
Within-subject Design
A research design where the same participants are subjected to each condition of an experiment, allowing comparison of their performance across conditions.
Q75: Refer to Figure 27.9, shown here. Which
Q96: Scientists generate phylogenetic trees for a group
Q103: Which of the following statements is NOT
Q113: Which of the following explains why the
Q144: Which of the following statements about cell
Q146: Which of the following factors likely did
Q146: Which of the following accounts for why
Q158: What structures are used in animal cells
Q171: Below are data comparing the abundance of
Q183: Archaea have been shown to inhabit which