The anatomical part of the lungs where oxygen and carbon dioxide are exchanged is the: trachea. alveoli. bronchioles. bronchi.

During what phase of meiosis is the DNA replicated? prophase I anaphase I metaphase I telophase I

To test the effectiveness of a new supplement, one group is given the supplement, and the other group is not given anything. Which is the most complete

Cells produced by the root and shoot tip meristems become the secondaryprimary tissues of the plant body.

State two functions of the cell membrane

During metaphase the spindle fiber form a lemon shaped array called the

as the flames heat the gasses in the hot air ballon, the volume of the gasses increases. At constant pressure, the volume of all gasses increase with temperature. Is this statement a scientific theory or law? Explain

What is a biological entity?

Toxic waste can enter foods through the contamination of groundwater. True or False?

An organism that is heterozygous for a particular character will generally show the recessive trait. a. true b. false

Some speciea undergo long peiods of stability interrupted by geologically brief periods of signifficant change. During these brief periods, new species may evolve. This pattern of evolution is part of the concept of