Which observation was a sign that a chemical reaction was occurring in this experiment

A) formation of a solid

B) change in color

C) formation of gas bubbles

D) production of light

In the case of biological magnification, organisms that are higher on the food chain have proportionally higher concentrations of the substance than do organisms that are lower on the food chain.

What is the difference between an ionic bond and a covalent bond?

Which of the following is a true statement? Land mammals such as bats, cats, dogs, cattle and mammoths became common during the Neogene Period. The first whales evolved during the Quarternary Period.

A benefit of aquaculture is which of the following? The increased cost of fish. The potential hazards of working around captive fish. The elimination of catching marine life other than the intended fish. The elimination of jobs for fisherman.

Which does not result in habitat destruction? composting road building farming animal grazing

A cell with a chromosome number of four undergoes meiosis what is the result

How does acid precipitation cause chemical weathering?

Chemical reactions in a cell

What is the name of the process of DNA formation from DNA?. A:transcription. B:translation. C:transduction

What is the number and variety of species that are present in a area?