Question

please help me to solve this question ​

Answer 1

Answer:

16 d)

15 don't know

14 a)

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Answer 2

Answer:

14. A is false but R is true.

15. A is true but R is false.

16. A is false but R is true.

Explanation:

Argon and calcium are isobars as they have same mass number that is 40 but different atomic numbers. While protium and deuterium are isotopes as they same atomic number but different mass numbers.

Skydivers need to use parachutes because those are the apparatuses that give human beings the ability to reduce their falling speed enough that they are able to land safely on the ground.