PHBV (Polyhydroxybutyrate-co-hydroxyvalerate) is a biodegradable polymer. It is a type of biopolymer that is made from renewable resources and can be broken down by microorganisms in the environment, making it environmentally friendly.
Thus, the only biodegradable polymer in the options is PHBV (Option D).

Identify the part of the sentence that contains a grammatical error:
Each of the boys have submitted their assignment on time.
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world