How did the duck-billed dinosaur tooth fossil lead scientists to believe that the plants existed in Antarctica.

An organism new to science was discovered during a recent underwater expedcition to the great barrier reef in australia. the organism is multicellular, and its cells contain chloroplasts, a nucleus, and organelles.

What moves lymph through the lymphatic system?

Watching salt crystals form as ocean water evaporates, a student says, "Look-more and more crystals are appearing. The ocean water is alive!" Which statement is an accurate evaluation of the student's remark? A.

In industrialized nations, childhood diseases have declined dramatically during the past half-century, largely as a result of

The fossil record of birds is incomplete because bird skeletons are

The relationship of blood flow (Q), resistance (R), and pressure (P) in a vessel can be expressed by which equation?

Plants that might be called "weeds" are often great pioneer species. What characteristics do they possess that would make them a successful pioneer species?

Which tissue type contains cells that can be described as long, cylindrical, multinucleated, and striated?

Which of the following is the correct explanation for linked genes?

A lizard lives in a desert. which would be an adaptation for this lizard?