Recall the caterpillar experiment in which caterpillars born in the spring looked like flowers, and caterpillars born in the summer looked like twigs. What is the most likely selective advantage for this difference in body shape?

Scientists believe there is a link between cigarette smoking and cancer. Evidence for this inference includes which statement?

Find the 16th term in the following arithmetic sequence. - 6, - 13, - 20, - 27, - 34

If the economy is too big, does it have a negative or positive effect on the environment?

What is another name for colonizing lands?

Identical twins are produced from the same sperm and egg (which splits after the first mitotic division), whereas fraternal twins are produced from separate sperm and separate egg cells.

Which of the following statements about the greenhouse effect is true? A. Life on earth is suffering because of the greenhouse effect. B. All greenhouse gases are harmful. C. Life on earth would not exist without the greenhouse effect.

Do all organism in the same ecosystem have the same carrying capacity

The locomotive behavior of earthworms is enabled by contraction of their longitudinal and circular muscles; this is seen through their typical burrowing behavior.

When the wind blows, this spins.

Which class of biomolecule do the molecules in the table belong to? A. proteins B. carbohydrates C. nucleic acids D. lipids