What happens to plants if the soil ph is too low

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.