Which one is chemical or mechanical weathering or are they both please someone answer please and no links

Many state and local authorities are making laws regarding recreation on lakes, rivers, and oceans to reduce water pollution. why would lawmakers need to consult with scientists before making these laws? a) to make scientists feel important b) so that the laws reduce pollution by a sufficient amount c) so that parks and lakefront facilities will still make large profits d) so that the public will believe that the laws are important to follow

2. what process do mrna and trna work together to complete? (3 points)

Draw the structure of dna nucleotide with adenine as nitrogenous base