Answer:
Plants, algae and photosynthetic bacteria provide an energy source for a majority of the worlds ecosystems.
Explanation:
I think all of the above...
because I know they built aqueducts and sewers, so since 2 of they are correct, then all 3 must be.
An amino group, a carboxyl group, and an R group
Answer:
Identifying the fossil is the first step. We have already identified this fossil as a clamshell. We know clam are from the sea, but if you didn't, you could conclude this from knowing where you found the fossil (likely near the beach). Discovering where it is can also lead you to a conclusion on it's arrival as a fossil, perhaps washed up on shore or buried by an animal.
Explanation:
Answer:
C. Shawna will walk along the meter stick and count how many steps she takes. She will then walk off a space of 1 m x 1 m
Explanation:
This procedure is likely to be the least accurate because it is difficult to be precise when measuring by taking steps.