Submit. Botanists group ferns, club mosses and horsetails together as being seedless vascular plants. A vascular system allows the movement of water and nutrients through the plant's body and, instead of reproducing with seeds, they reproduce asexually with spores.Most seedless vascular plants grow on land in moist areas.ubmit. Botanists group ferns, club mosses and horsetails together as being seedless vascular plants. A vascular system allows the movement of water and nutrients through the plant's body and, instead of reproducing with seeds, they reproduce asexually with spores.
Selecting the best lens for welders' eye protection. In the industrial environment, safety glasses are a necessity for jobs that put employees' eyes at risk of exposure to heat, impact, chemicals, or dust. But workers also need protection from nonimpact dangers, such as radiant energy, eye strain, and fatigue.
A. I think there is a problem with terminology-- frames for eyeglasses are brazed not soldered, since the temperature exceeds 450 Â°C. Titanium in the presence of any oxygen forms a tightly adherent oxide layer, which impairs joining by brazing, welding, etc. Therefore, titanium is brazed in an argon atmosphere, without a flux, using different types of filler metal.