Environmental science, check my answers?

1. most familiar life forms live in regions of biomes that humans inhabit.
true <
false

2. biodiversity is the variety of life forms that exist or existed in the past.
true <
false

3. changes in an organism can't occur because of an outside force, such as a massive earthquake.
true
false

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen