A man inside the water seea a fish in water. will the fish appear to man in it's actual position? will the man appear to fish in his actual position?

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 object a collides with object b and bounces back its final momentum is?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c