According to most scientific models how many years ago did the first simple cells appear on earth?

Describe the differences between a chromosome and a DNA molecule.

For linked genes a, b, and c, the fraction of single crossovers for genes a and b is 0.1, the fraction of single crossovers for genes b and c is 0.3, and the fraction of double crossovers is 0.03. which of the following statements is true?

Darwin concluded that because more individuals were born than could possibly be supported by the environment there?

In order for an statonary object to move, an unbalnced force must act upon it. True False

A researcher came across a red flower with a white flower. to his supprise, some of the offspring turned out pink, this is most likely a result of what? A. codominance B. incomplete dominance C. mutation

Consider a population of bacteria that came from a single ancestor. because bacteria reproduce asexually, there should be no variation in this population, but that violates the first postulate of natural selection.

Through what process do cells become specialized so they can perform specific functions within organisms?

How does a gradient of a river affect its flow

What is the main function of cuticle in plants? 1. It prevents water loss. 2. It absorbs sunlight. 3. It protects the plant from predators.

What minerals are found in bone? What do these minerals do for your bones