The photograph shows a sample of stained frog blood cells as viewed with the high-power objective of a compound light microscope, with a specific structure labeled "A". Which of the following is the BEST description for the structure labeled "A?"
A Chloroplast that carries out photosynthesis
B Lysosome that stores hydrolytic enzymes
DC Mitochondrion that produces ATP
OD Nucleus that regulates cell activity

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water