In the human body, what are systems made of?

What characteristic of amphibians necessitates that they live near water?

What else does the food chain tell you about the relationship between organisms

Both bacteria and rocks split to give rise to more of their kind. Why are bacteria said to reproduce, but rocks are not?

The symptoms of an immune complex reaction are due to

Besides respiration, what other ways is carbon released into the atmosphere?

In terms of volume how does the size of a red blood cell compare to the size of an enterocyre

4. How is the DNA described and what does this mean?

In humans red blood cells are primarily produced in the red marrow, to which body system does the red marrow belong to?

Many bird species have beaks shaped just right for eating the types of seeds that are found in their given environments. This is an example of which of the following? feedback mechanism habitat adaptation precipitation

Some scientists have hypothesized that the first vertebrates, which were fish, may have evolved from an ancestral tunicate that became sexually mature in the larval form.