Which best describes a theory?

an educated guess

a well-supported conclusion

a proven fact

an untested claim

A group of scientists is developing a new chemical compound. They want to test its effects on an aquatic ecosystem using a nearby ocean bay.

A plant has flowers with 18 petals. What would you expect to find when you look at the plant's leaves?

A simple apparatus used to show the process of osmosis is an

The wings of insects, birds, and bats evolved independently but carry out similar functions. This is an example of A. analogous structures. B. embryonic structures. C. vestigial structures. D. homologous structures.

Iron reacts with atmospheric oxygen to form iron oxide or ferric oxide. Look at the chemical equation for this reaction: Fe + O2 → Fe2O3 This equation is unbalanced.

How is anaphase 2 similar to anaphase in mitosis?

Which is a likely location for primary succession?

How many dna fragments left when you use two restriction enzymes?

Matter and energy in the web of life

In the (Blank) the body reacts to each kind of pathogen with a defense targeted specifically for that pathogen.