Observation is made using one or more of the five senses.
an independent variable is a variable that’s changed in an experiment.
an explanation based on an observation is a/an
there may be only one variable in an experiment.
observation is made using tools or measurement.
what’s the difference between an observation and inference?

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.