A yeast, Saccharomyces cerevisiae, glucose and water are mixed in a test tube. The diagrams shows the test tube at the start and after two hours. Which process causes this change?
A. Reproduction
B. Respiration
C. Growth
D. Sensitivity

I couldn’t find the exact image but this is the closest to it I could find. I hope anyone can help

compost can be added to topsoil as a:

pesticide

the correct option is option d

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.