A researcher wants to know the average age of teachers in a certain community. 50 teachers from junior high school and 25 teachers from senior high school were interviewed for the purpose. How will the researcher choose a sample size of 20 using:1. Simple Random Sampling -2. Systematic Random sampling -3. Stratified Random Sampling -4. Cluster Sampling -

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in a biology class, the teacher started explaining a new lesson about the dna structure. personally, i found this lecture hard to understand. so i decided to use my critical thinking skills to be able to understand it. i analysed the different ideas, and broke them down into smaller parts to assimilate each. then i started evaluation and tried to link what i am learning with real life experiences so that i can make sure that i know how everything i am learning relates. finally, i started questioning by researching more what i learned and asking more questions that can me through my learning process. reflecting on the information meant that i should review it. all this me greatly understand what i previously found hard to understand.

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if you break down the data from the global footprint network, china exerts far more pressure on its ecosystems per capita than america in terms of crops, grazing, foresting, and fishing. but where america blows everybody out of the water is carbon emissions per capita

what are the events?