This is the one factor that is changed or tested by the person doing the investigation.

What percentage of a meal has been absorbed by the time it leaves the small intestine?

A bacterial cell measures 2.5 micrometers (µm) in length. What is the size of this cell in nanometers (nm) ?

What was the first genetically modified animal?

Which experiment is more likely to be reliable, and why?

All BUT ONE of these scientists worked on the development of the double helix model of DNA. The scientist NOT involved in this research was A) Crick. B) Franklin. C) McClintock. D) Watson.

A plant with two dominant OR two recessive alleles is said to be True breeding Cross pollinating Homozygous Heterozygous

How is it possible to say that there are 2.3 deer per square mile

Which species is an example of an autotroph? a. ladybird c. frog spawn b. bumblebee d. lotus flower

What can be inferred from the phylogenetic tree shown? A) Flagellates and Animals are more closely related than Fungi and Animals. B) Ciliates and Diplomads are more closely related than Plants and Ciliates.

The food web in a diverse ecosystem is