What is the most common element in a star such as the Sun?

Select one:

a. helium

b. oxygen

c. nitrogen

d. hydrogen

Information is detected by the eye and sent to the brain by which of the following structures? A. blood vessels B. sensory neurons C. smooth muscle D. spinal cord Explain the process

In the early 1700s Linnaeus came up with a new system of classification of living things that eventually replaced the one that had been used since Aristotle developed it in ancient Greece about 2000 years earlier.

Suppose that an increase in water vapour resulted in an increase in the number of cloudy days. These clouds kept the Sun's light from reaching Earth, thus lowering the average temperature.

Two species of fish had recently undergone sympatric speciation. The males of each species had a different coloring through which females could identify and choose a partner from her own species.

You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown), br (red), bg (green), and by (yellow).

How are mosses and horsetails similar to ferns

Determine approximately how much total energy is lost from a three step food chain if 1000 calories enter at the autotroph level

Give two examples of equations for the synthesis of transuranium elements by transmutation

In muscle the source of a "phosphate molecule needed to recharge an adp molecule to an atp molecule" is

5. What would occur if ... a ... the wildflower population decreased?