In which organism will pharyngeal arches be visible in the embryonic stage? (barnacle, fish, caterpillar, or snail? )

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Which animal is a producer in this ecosystem