After 24 hrs, the amount of gas that accumulated at the top of the inverted test tube is measured. the students conclude that the light source is causing the water to evaporate, causing water vapor to fill the top of the tube. the best alternative explanation of the differences between the setups is that the - a. light caused the elodea plants to photosynthesize, releasing o2 gas b. gravity increases the downward flow of the trapped water c. metabolism of the elodea plants absorbed co2 from the water d. heat from the light source caused the escape of the dissolved gas

Answer:

light caused the elodea plants to photosynthesize, releasing O2 gas

Explanation:

Oxygen is a by-product of photosynthesis. In presence of light, water molecules are split into hydrogen atoms and oxygen gas. The elodea plant is photosynthetic in nature. Later, the hydrogen atoms combine with carbon dioxide to form simple sugars like glucose in the dark stage.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.