Answer:Particle pollution and health risks, including premature death. Health effects may include cardiovascular effects such as cardiac arrhythmia´s and heart attacks, and respiratory effects such as asthma attacks and bronchitis.
Explanation:
Answer:
""My first day at school was intresting!there was alot of people that i didnt knew and i could talk to them without being shy,however there was people who tried to make me sad,but i didnt allow them to make me upset.The things we did there was so intresting!.My first day was neutral as my everyday life,i would get used to this like all over again.
Perhaps,people would accept me as how i am.I like to know people's personalities and they'fun!
(i tried to help,you can improve it or put it in your own words)
Answer:
1.) stromatolites
2.) photosynthesis
3.) Ordovician
4.) Cambrian
5.) oxygen
6.) As Earth cooled, carbon dioxide dissolved in the early ocean. Cyanobacteria consumed carbon dioxide and converted it to oxygen. Methane was removed from the atmosphere as oxygen was produced, eventually leading to the Cambrian Explosion.
7.) Metabolic processes that use oxygen produce more energy than anaerobic metabolism. Simple diffusion of oxygen would limit the size of a multicellular eukaryote, but animals evolved ways to transport oxygen to their tissues, which permitted an increase in size.
Explanation:
From Penn
