A ___ is a factor in an experiment that can be manipulated.

correlation

constant

variable

placebo

What are the four primary zone of earths interior?

Modern geology was established during the:

Earth is continually changing. Erosion leads to areas being slowly covered by dirt and rocks. As more soil gets deposited, it begins to increase the amount of pressure on the rocks, soil, and organic matter underneath.

Which of the following is NOT a characteristic of the nucleus? A. Controls functions of the cell B. Contains DNA in chromosomes C. Is surrounded by the nuclear membrane. D. Are spherical, rod-shaped organelles

Which Prussian statesman was known as the "Iron Chancellor"? A. Franz Josef B. Jakob Grimm C. Otto von Bismarck D. Wilhelm I

Which human activity has had the greatest impact on climate change? A. deforestation B. burning fossil fuels C. production of nuclear waste D. building skyscrapers

Check answers. 1. The active site A. Located in an enzyme (my answer) B. Is rich in amino acid C. Is located on a substrate D. A and B E. B and C 2. Anabolism is defined as the A. Sum of all chemical reactions B.

How are genetic characteristics associated with nonreproductive activities such as feeding affected by natural selection?

Smooth muscle is found in just one place in the body. true or false

Which of the following characteristics evolved independently in mammals and birds? A) bilateral symmetry B) amniotic eggs C) jaws D) bone E) endotherm