What is one sign that indicates a physical change?

a) matter changes, but no new substance is formed

b) a substance changes color when exposed to air.

c) something catches fire and turns back

d) temperature drops as two liquids are mixed together

Bohr found experiment evidence for his atomic model by studying

What is an example of active immunity?

What does a blood glucose level of 107 mean?

Question 1 Which statement best describes evolution? Species have changed over time. Traits acquired during a lifetime are passed to offspring. Earth's organisms have not changed over time. All of Earth's organisms were formed at the same time.

The first step of cellular respiration involves

Un ejemplo de mitosis en el trabajo es una hoja que: A) se vuelve amarilla. B) Creciendo tomando dióxido de carbono c) Hospedar una oruga

During transpiration, water exits the leaf via the A. mycorrhiza. B. stomata. C. roots. D. tracheids.

How do you call a prokaryote kingdom that typically live in oxygenated environments, and are not as adapted to harsh environments as the other prokaryote kingdom?

Rosa has a vegetable garden. She places earthworms, which are decomposers, in the garden soil. What is Rosa most likely trying to do? A. prevent insects from eating the plants B. create usable food energy for the plants C.

A transposable element (TE), or transposon, is a __ sequence that can change its __ within a genome, sometimes creating or reversing mutations and altering the cell's __.