What is the name for a change in the enviorment that causes an organism to change it's activity PLEASE HELP BY TODA!!!
A, brain
B, Response
C, Parasite
D, stimulus

Word equation for k+ h2o yield koh + h2

27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?