1. any condition that influences the growth or survival of an organism is 2. when two organisms try to fill the same niche, results. 3. a limiting factor at ground level in a rain forest is pick any question and answer! will give if you answer worth 30 points paper due tmrw

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.