Twi scientists are cutting samples of leaves for analysis. one scientist always clips a sample from the base of the leaf near the stem, and the other scientists always clips a sample from the tip of the leaf. this illustrates a a. procedural error. b. calibration error. c. measurement error. d. unit error.

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm