What do close contour lines indicate?

 A series of concentric contour lines that are closed onto themselves indicate mountains or hills. Closed contour lines look like misshapen circles or loops.The lines get closer to each other as the slope gets steeper. If the area has a gentle gradient, the contour lines are more spread out.

Explanation:

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.