Many butterflies in the genus Heliconiusare mimetic, which means that they closely mimic the wing patterning and color of highly poisonous species even though they themselves are not poisonous. This is a benefit because many predators (such as birds) learn to avoid poisonous species by identifying their wing patterns/colors. Some closely related Heliconius species mimic different poisonous species. Although they can successfully hybridize and produce viable/fertile offspring that have high fitness in the laboratory, the hybrids are intermediate in wing patterning/color and are not good mimics. Consequently, they have low fitness in nature. This is an example of:

Extrinsic postzygotic isolation.

Explanation:

Extrinsic postzygotic isolation makes a hybrid zygote unable to develop into a viable, fertile adult. This is the case with the hybrid butterflies having intermediate/medium wing patterning/color who are unable to produce viable offspring. The reason behind this change could be ecological or behavioural

golgi body just took the test on edge

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.