Which level of organization in the human body does the diagram best represent?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

When fossil fuels are burned, carbon dioxide is released. how does this gas impact the environment?