What human activity produces the most methane gas?

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

Use the above pedigree for questions 1,2, and 3 1. what kind of genetic disorder is represented in the pedigree? a. recessive b. dominate refer to the pedigree in question 1. 2. is the mutated gene in this disorder located on a sex chromosome (x or y) or an autosome? a. sex chromosome b. autosome refer to the pedigree in question 1. 3. which generation has individuals that you are certain are heterozygous for the mutated gene? a. generation 1 b. generation 2 c. generation 3