According to the big bang theory, how long ago did the universe begin? 5 to 10 billion years ago 13 to 15 billion years ago 23 to 25 billion years ago 30 to 40 billion year ago

Which of the following are true about bacteria? select all that apply. bacteria are all around you. bacteria can or harmful. bacteria are multicellular organisms. bacteria can only be found on the human body.

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.