1) In 2010, the concentration of carbon dioxide in the atmosphere was 390 ppm (parts per million). If the annual rate of carbon dioxide increase is 1.4 ppm, what concentration of
carbon dioxide do you predict for the year 2050?

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

not only is it colder, it also becomes darker, less salty, and more dense.

your spelling is a little off : ]

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: