Biodiversity is the variety of different types of life found on Earth and the variations within species. It is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation (number of species) within an area, biome, or planet.
Shop By Brand. Bosski Inc. Chain Saws Direct is your online chain saw superstore. We carry a wide selection of residential chain saws, occasional use chain saws, professional chain saw, electric chain saws, gas chain saws and chain saw accessories from Earthquake, Earthwise, Husqvarna, Poulan, Poulan Pro, Remington and Tanaka.
ABEC ratings are only odd numbers and start with ABEC 1. 1  ABEC 1 is the most crude, the least precise, the most durable and the cheapest. 2  ABEC 3 is what most cheap complete skateboards come with, especially skateboards from China. ABEC 3 bearings will work for most skateboarding, but won't roll very smoothly or fast.