How can natural selection affect the songs that birds sing?

How is there 50 fish in the sea and not 2200000?

In rabbits, gray hair (G) is dominant to white hair (g), and black eyes (B) are dominant to red eyes (b). these two traits are independent of each other.

Waterweed grows near the surface of the water in lakes and ponds. It often grows in dense clumps. It has been observed that the chloroplasts in this plant move around inside the cell. How might this be an advantage and a disadvantage to the plant?

Jupiter is a planet that ... a. rotates upon its axis and revolves around the Moon. b. revolves upon its axis and rotates around the Milky Way Galaxy. c. revolves upon its axis and rotates around the Sun. d.

At which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?

How are mitosis and meiosis similar? a. they both have prophase and metaphase. b. they both produce gametes. c. they both produce tetrads. d. they both reduce the chromosome number?

Blank is between the times when a cell is dividing

Magnetometers revealed that the basalt rocks along the mid-ocean ridges are aligned in alternating, symmetrical patters.

A scientist wants to find the percent of teens that like the taste of "brand X"lemonade over "brand Y" lemonade. She conducts a taste test of 500 teenagers. She gives each teen a bottle of lemonade with the labels showing the brand of each lemonade.

Ow many molecules of water are released during the polymerization of a 20 monomer-long cellulose molecule?