shows the interaction among many different food chains in a single ecosystem. food chain. the way in which the organisms in an ecosystem interact with one another according to what they eat, eating the organisms below it. symbiosis.
Equitation is the art or practice of horse riding or horsemanship. More specifically, equitation may refer to a rider's position while mounted, and encompasses a rider's ability to ride correctly and with effective aids. In horse show competition, the rider, rather than the horse is evaluated.
1 If the branches are three-sided and horizontal to drooping, then you have Equisetum pratense, Meadow Horsetail. 2  If the branches are four angled and vigorously ascending, then you have Equisetum arvense, Field Horsetail. 3  If you have a Scouring Rush (an unbranched Equisetem), look closely at the stem. Because Equisetum are rarely encountered as lone stems in the field, a quick survey of the clump is sufficient to determine subgenus. 2  If you have a Horsetail (a branched Equisetum), look closely at the branching.