What sex will a lion cub be if the father contributes a Y chromosome? 1. Can't tell; must know the chromosome the mother contributes
2. Female
3. Male

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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.