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

Tasha went on a trekking expedition to a mountain range during her vacation. When she reached a particular height, it started raining heavily. Which sphere of Earth is responsible for this sudden weather change?

This type of membrane lines a body cavity that does not open directly to the exterior and the organs contained in that body cavity.

Geneva was walking on the beach on a crisp November morning when a cool wind came her way. How would Geneva's body respond to maintain homeostasis?

Does commensalism involve abiotic factors or biotic factors?

Mountains also have an unmatched power to drive human evolution. Starting tens of thousands of years ago, people moved to high altitudes, and there they experienced natural selection that has reworked their biology.

What covers the ends of bones in adults? A blood B cartilage C marrow D ligaments

If gene expression control occurs during transcription, when did it occur?

If selfing starts in a previously randomly mating population composed of 0.50 heterozygotes, what is the frequency of heterozygotes after three generations of selfing

The movement of a bird away from a grass fire is caused by A) receptors initiating a stimulus B) impulse forming in a muscle tissue C) muscles responding to a stimulus D) effectors synthesizing neurotransmitters

What does a reflectd light look like