If you found a human skeleton that you believe is approximately 20,000 years old, which radioisotope would you use to date it?

235U

238U

14C

40K

Cells require lipids to

What is one piece of evidence that caused Wegener to think that continents moved? A. He found an old map of the world that showed movement, B. He found similar fossils on different continents that are separated by oceans. C.

How does the immune system know if a foreign particle has infected the body?

Which cells are divided by meiosis and mitosis?

When we extracted our own DNA last Friday, how did the things we used (Gatorade, alcohol, soap) relate to the things that are used in this virtual lab?

Which of the following statements about the germ layers is NOT correct? - The germ layers (ectoderm, mesoderm, and endoderm) arise from the embryonic disk. - The endoderm gives rise to the nervous system.

Why are the oceans becoming acidic? A) Because of global cooling B) Because of excess carbon dioxide in the atmosphere reacting with water and forming carbonic acid C) Because of the dissolution corals (calcium carbonate) D) Because of alkaline rain

What is the possible genotype and phenotype for the dominant trait circular flower and recessive trait square flower

What is representative organism?

What multipies to get - 12 but also has a sum of 4