Which best describes primary succession?

What is the name given to the part of an enzyme that a substrate binds to?

What is the effect of differential reproduction over time? How is the sickle-cell allele maintained through natural selection?

Which of the following differentiates B cells and T cells? a) T cells but not B cells can directly attack and destroy invading pathogens b) T cells but not B cells have surface markers c) T cells but not B cells are stimulated to increase the rate

Quartz is quite resistant to weathering and is an important component of sands in riverbeds and on beaches. true or false

Which of the following are other natural hazards that can occur due to volcanic activity? Which of the following are other natural hazards that can occur due to volcanic activity? Select all that apply A. Fires B. Tsunamis C. Earthquakes D.

The children in a family all have blue eyes. the biological parents also have blue eyes. the science that explains these similarities is called genomes. a. True b. False

An increase in the level of hormone A causes an increase in the level of hormone B. The increase in the level of hormone B then causes a decrease in the level of hormone A.

What did the shift from hunting and gathering to gardening lead to?

In the human body, oxygen is absorbed by the lungs and nutrients are absorbed by the small intestine. In a single-celled organism, this absorption directly involves the 1. nucleus 2. chloroplasts 3. cell membrane 4. chromosomes

The big chunks of earth's crust (plates) slowly moved around. This is called?