Why do scientist often repeat experiments everal times>?

Which evolutionary mechansim caused the increased

Explain how the retreat of North American glaciers 16,000 years ago influence the distribution of trees.

The law of supply suggests that the price elasticity of supply is

A person who's resting heart rate is 55 and after exercise, his heart rate is 160, is said to have a well developed heart muscle. Why is this so?

The snake that eats the frog in the food chain is called a

All cells in your body do not exhibit all of the traits you have, yet they all have the same DNA. Explain this.

A cell has chloroplasts, numerous ribosomes, an endoplasmic reticulum, and a cell wall. what type of cell is this?

The mitochondria does?

In blank, one diploid cell divides and makes four haploid cells

The cellular machinery that replicates DNA inserts an incorrect base A) most of the time B) about half the time C) roughly once on every million bases D) roughly once in every 10 million generations