Which of the following is the best definition of climate? 1 . The day to day changes in the atmosphere

2. The average weather over a long period of time and over large areas

3. The state of the atmosphere across the world

*will mark brainliest for first correct answer* which of the following is most likely to affect the biodiversity of a park ecosystem? a. less rain than usual for several months b. ongoing pollution from a nearby factory c. park rangers plant a new type of tree d. disease wipes out an entire population

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled