How do most ecosystems get their energy?

from the available food

from the sun through photosynthesis

from the energy the animals absorb

from the plants that grow in that ecosystem

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

What drives the atp synthase reactions that produce atp