Acertain slide projector has a 100 mm focal length lens. how far away is the screen, if a slide is placed 103 mm from the lens and produces a sharp image?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

What is the mass of the same rock on the earth

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f