Answer: A warm front forms when a warm air mass pushes into a cooler air mass, also shown in the image. Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms.
Answer:
None of these.
Explanation: The plants like cycads and ginkgos have swimming sperms. they need water to complete their life cycle.
There are many adaptations seen in the plants like liveworts, ferns and mosses in which they require water to complete its life cycle. This adaptation is not only restricted upto cyptograms. This can also be seen in the plants like ginkgos and cycads. Their sperms are very strange.