How long can a healthy ecosystem remain stable? A. five to ten years B. one year C. hundreds or thousands of years D. about fifty years

When analyzing tree rings, what do scientists assume a thin ring indicates?

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.

In cellular biology, what is the definition of the word specialized? te o a. carried across the cell membrane by a specific protein a o b. a structure within a eukaryotic cell that performs a specific function o c. adapted to a specific function or condition es essere beste ser bendere s b tele ee o d. containing unique dna ser eeseen les, e nde este ses see ste submit e