sentences: plant reproduction / seed production requires pollination & pollination requires pollinators / pollinating animals ->  plant reproduction requires pollinating animals  plant reproduction requires pollinating animals & if a process requires something then that something helps that process ->  pollinating animals help plant reproduction  a hummingbird is a kind of bird & a bird is a pollinating animal ->  a hummingbird is a kind of pollinating animal  pollinating animals help plant reproduction & a hummingbird is a kind of pollinating animal -> hummingbirds help plant reproduction