Physical barriers that help prevent an individual from contracting diseases include . A. White blood cells, enzymes, tears, and skin B. Sweat, stomach acid, skin, and enzymes C. Sweat, tears, skin, and mucus membranes D. Enzymes, mucus membranes, stomach acid, and tears Please select the best answer from the choices provided. A B C D.

Draw the structure for 5-isopropyl-2-methyl-3-nonene

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by