Which statements are correct concerning human DNA? Select all that apply. 1. Each strand contains chromosomes from one parent.
2. It contains 23 chromosomes
3. It contains 46 chromosomes
4. Each chromosome contains 23 genes.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

the index of refraction of the second medium is higher. i just took the test trust me !