In 2001, endospores of bacillus anthracis, the causative agent of anthrax, were sent to government officials and news agencies via the mail. in response, the us postal service began to irradiate mail with uv light. was this an effective strategy? why or why not?

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes