The answer is; asexual reproduction
This involves the splitting of the mother cell into two identical daughter cells, genetically. There is no variation between the mother and offspring as it would occur in sexual reproduction. The only variation is brought about by mutations.
However, occasionally, these bacteria reproduce sexually by conjugation. In such cases the genetic material of one bacteria - ‘the male’ - is transferred to the ‘ female’ bacteria through an appendage called pill.
The lungs expand and with that you breathe in air as the diaphram contracts and relaxs to cause "breathing"
The gas pedal opens the throttle. This supplies air to the engine and fuel is metered into the air stream to provide a combustible mixture to the engine. If the throttle is close, I.e., you lift you foot, this process stops and the engine slows to an idle setting where enough fuel is provided to keep the engine turning over but not to move the car at any significant speed. When your cruising at a steady speed, even on a flat road, the engine turns over faster and requires enough fuel so that air resistance are overcome as well as internal friction losses in the engine.
Answer:
There were mutations that led to some longer necks and some shorter necks, as the trees became taller, the short necks died out due to starvation, leaving behind only the longer necked giraffes. Survival of the fittest.
I think it’s D!!!!! Snsnsnsn