first used the term cell when he used a (5) to observe box-like structures when he was examining cork under a microscope. (6) also saw what we know know as (7) when looking at pond water. These observations, along with the observations of several other scientists over the course of 200 years, lead to the development of the (8).

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean