What causes scientific knowledge to change over time? A. Living systems are constantly changing, so previous explanations
may no longer apply.
B. Scientists try new ideas to keep their work interesting.
O C. New data can lead to a reevaluation of earlier scientific
explanations.
D. New technology proves that earlier scientists based their
explanations on biased views,

A: Living systems are constantly changing,so previous explanations may no longer apply

Explanation:

Hopefully this helps!

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption