Birds evolved from

A. insects.

B. a common ancestor with reptiles.

C. amphibians.

D. mammals.

Many chemicals are used to kill insects and protect animals. How could the removal of insects upset the balance of the ecosystem?

One difference between a cancer cell and a normal cell is that a. cancer cells divide uncontrollably. b. normal cells divide uncontrollably. c. cancer cells cannot make copies of dna. d. normal cells cannot make copies of dna.

The change in a gene due to the insertion or deletion of one or more nitrogen bases, which causes the subsequent triplets to be rearranged and the cod?

41. What is upwelling in the ocean? 42. What is brought to the surface as a result of upwelling? 43. What does brackish mean? 44. What bodies of water would be brackish? 45. What type of technology is primarily used to map the ocean floor? 46.

What would happen to the hawk population if most of the mice left the area because of habitat destruction?

Which of the following animals is a deuterostome? chordate mollusk arthropod annelid

Middle layer of the wall of an artery or vein allowing it to withstand and modify blood pressure is

Strobe lighting tends to create hot spots and can make a portrait uncomfortable for the individual. True or false.

Which is a biological activity a person can do at the beach? Question 17 options: experiment with sand erosion patterns identify various minerals in the sand measure tidal differences during the day observe the feeding behaviors of gulls

What type of alternative fuel comes from soybeans?