Answer:
D. independent; dependent
Explanation:
The dependent variable is the variable that is being measured during the course of an experiment. It represents the variable that changes with the manipulation of other variables.
The independent variables are variables which are varied or manipulated during the course of an experiment. The effects of their variations are measured on the dependent variable.
<em>In this case, the interval between the bell and presentation of food was varied and the effects of the variation was measured by determining the amount of salivation.</em>
Hence, the interval is the independent variable and the amount of salivation is the dependent variable.
The correct option is D.
Answer:
B. 2.5
not 2.5m because IMA is unitless.
When air is blown across the top of an open <span>water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced in a process called "refraction".
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The focal length, like you said it's the distance between the FOCAL point and the mirror.
<h2>Answer: Venus</h2>
Galileo was the first to use the telescope to observe the heavens, mainly observing the Moon, the Sun with its sunspots, Jupiter with its moons and Venus (in the early 1600s).
In the case of Venus, he observed that it presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth.
This is because Venus presented its smaller size when it is in full phase and the largest size when it is in the new one, when it is between the Sun and the Earth.
These images along with other discoveries were presented to the Catholic Church (which supported the <u>geocentric theory</u> for that time) as a proof that completely refutes Ptolemy's geocentric system and affirms <u>Copernicus' heliocentric theory.</u>
