7. Which statement about the use of independent variables in controlled experiments is correct?
a A different independent variable must be used each time an experiment
is repeated.
b. The independent variable must involve time,
c. Only one independent variable is used for each experiment.
d. The Independent variables state the problem being tested

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

All eukaryotic cells contain small bodies called

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes