Different characteristic features of modern humans, such as skin color and hair form, offer substantial clues to ancestral origin (for example, african versus asian). what do we know about genetic variability between the many distinct geographic populations of modern humans? group of answer choices human variation is lower between populations that reside on the same continent, but increases with intercontinental distance. there is very little genetic variation on a regional level, but substantial variation with increasing geographic distance. genetic studies have failed to resolve most population-level differences despite the obvious morphological differences seen between races. the vast majority of variation in humans occurs within, not between, populations. human groups are not genetically distinct.

How does science influence the decisions made about social, economic, and political issues?

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

18. determine whether each stateme blank space given. ach statement is true (t) or false (f). place your answer in the 8. when a cell is put into an isotonic solution, individual wat put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. d. when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell. c. when a cell is put into a hypotonic solution, there is a net movement of water molecules across the cell membrane out of the cell. d. the movement of any solvent across a semi-permeable membrane is called osmosis. e. carrier proteins have the ability to change shape and physically move molecules across the cell membrane. f. in facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the cell.