Which situation results in a characteristic that is
inheritable?
(1) a limb is lost when two marine organisms fight.
(2) a puppy learns to beg for food by watching
an older dog perform tricks.
(3) a gene is inserted into a bacterium, allowing
the organism to produce insulin.
(4) a random mutation causes the immediate
death of a microbe.

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.

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.