Organic compounds Question 8 options: always contain carbon. are synthesized only by animal cells. always contain oxygen. can be synthesized only in a laboratory. always contain nitrogen.

This is collection of data made by comparing objects in standard units. in science, the units are metric.

Organ systems are composed of organs, organs are composed of tissues, and tissues are composed of cells. this pattern is organized into levels. organization based on levels can be found in what

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern’s leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon?