The blastocyst is comprised of three layers. which of these layers will develope onto digestive and respiratory systems?

Which can be an effective way to reduce stress? a) getting in the habit of doing things perfectly the first time b) engaging in a fun physical activity on a regular basis c)taking an antacid for a stress-based stomachache d)studying extra hard the night before a test

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Bacteria can cause different infections, check all that apply. a. sore throat b. measles c. ear infection d. flu e. cavities