Sand dollars are radially symmetrical and have an internal skeleton but no backbone. Which phylum do sand dollars belong in?

A) chordates

B) echinoderms

C) arthropods

D) mollusks

Which phrase describes runoff? A) underground water that flows into lakes B) river water that empties into an ocean C) water from streams that flows into larger rivers D) water from rain and snow that travels to streams

What process often begins by a portion of population becoming physically or geographically separated?

What are three ways RNA differs from DNA

A student monitored tides using a webcam. She noticed that the tide reached different parts of the shore at different times of day. Which factors can explain the student's observations?

These diagrams demonstrate how cells can be differentiated by their

What does the genome of a transformed e coli cell contain that a normal e coli cell does not contain?

All plant and animal groups existing together and the physical factors with which they interact compose a (n) a. climate. b. kingdom. c. ecosystem. d. weather pattern.

Four strategies have been proposed to increase the world's food supply in places where populations are underfed

Mark observes that when his father throws a basketball, it bounces higher than when Mark throws the same ball. He wonders, "Is this because my dad is much taller than me?" What can Mark do to best answer his question? Shop for another basketball.

In angiosperms, flowers are adaptations for reproduction. Which of the following does NOT usually describe flowers that are pollinated by animals? A. They are tiny. B. They pollinate more efficiently than wind-pollinated plants. C.