What reproductive benefits do angiosperms have over mosses?
this is for my biology course. it was a question on one of my assessments and i got it completely wrong. can someone explain it to me so i can at least try to understand it?

Angiosperms are flowering plants. To start with, pollen allows the sperm to be transported without water. Mosses need water so their sperm can swim (moss sperm is flagellated), and the sperm can't survive being dried out. In angiosperms, the sperm cells are kept safe inside a pollen grain, and the pollen grain itself can be transported in a variety of different ways (e.g. wind, bees, birds, bats, etc.) The flower itself plays a role here, because it can attract pollinators. After fertilisation, the seed shells protect the embryos (seeds contain baby plants in a kind of dormant state), a secondary endosperm provides the embryo with food, and outside the seeds, you're going to have some kind of fruit. Fruits play an important role because they aid in the distribution of seeds. If a bird eats a berry, for example, there's a good chance that the seed will pass out the other end of the bird somewhere else and sprout into a new plant, or the bird might pick up some berries and drop them or even hide and forget them. Mosses don't have this option.

Angiosperms are plants that flowers. In angiosperms, pollen allows sperm to be transported without the aid of water. On the other hand, mosses needs water so their sperm can swim and survive. Angiosperms are more capable of reproducing because the transport is much easier as compared to mosses.

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.