Yo can someone help me out This is a psychology question lol Which of the following is classified as a depressant? (3 points)

Heroin

Nicotine

Alcohol

Cocaine

Marijuana

Ialready know the answer to this question but i wanted to ask you guys to see if you know. who started the okinawan karate style ryukyu kempo? when year was it found?

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

The pka of three different c―h bonds is given below. explain the observed trend in pka. select the single best answer.