Who was the first person to observe dead cells

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

What is any method of measuring the age of an object or event in years, such as using atomic half-life?

In cellular biology, what is the definition of the word specialized? te o a. carried across the cell membrane by a specific protein a o b. a structure within a eukaryotic cell that performs a specific function o c. adapted to a specific function or condition es essere beste ser bendere s b tele ee o d. containing unique dna ser eeseen les, e nde este ses see ste submit e