During nuclear decay , a new isotope is created . How is the nucleus of the new isotope different from the parent if the parent isotope has undergone alpha decay ? A) The atomic number decreases by and the mass decreases by 4.

B) The atomic number decreases by 2 and the mass increases by 1.

C ) The atomic number increases by 2 and the mass remains the same.

D) The atomic number remains the same and the mass decreases by 1.

The answer is A because I just did it

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx