A study was completed to determine the effect of the banded tetra on other plant and animal populations in its tropical stream environment. The scientists looked at the population level of other species before and after they removed banded tetras. What MUST be TRUE about the banded tetra?

A

The banded tetra is a keystone species.

B

The banded tetra is a foundation species.

C

The banded tetra is in a parasitic relationship with these other populations.

D

The banded tetra is in a mutualistic relationship with these other populations.

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.

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

What could happen if two base pairs on a strand of dna or switched