NEED A BIO EXPERT TO HELP ME WITH HW!! Please answer if you have learned about this before, don't guess and explain your answer without plagiarizing from the web. I will pick brainiest - thanks

***THIS IS COLLEGE BIOLOGY: if you're in middle school or high school, don't answer this

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

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: