Respuesta :
d.Climate change takes place at a varying rate over time.
Answer: a.Climate change takes place at a constant rate over time.
Explanation:
A climate can be define as the average state of the everyday weather condition which remain probably stable for a period of 30 years. It is measured by various parameters like atmospheric pressure, temperature and humidity.
On the basis of the above description, a.Climate change takes place at a constant rate over time. is the correct option.