For protection and support.

Invertebrates may have an

Vertebrates have a backbone and an

How did short term catastrophic events, such as volcanic eruptions and asteroid collisions affect the climate and biosphere?

Which are the two parts of the mitochondria

What organic compound used for stored chemical energy

Which hormone controls production and secretion of adrenal cortex hormones? select one: a. corticotrophin b. aldosterone c. testosterone d. melatonin?

In which step of the scientific method would you refine your hypothesis, if necessary? observation hypothesis experimentation conclusion

Which of Mendel's laws BEST explains why genetic variations occur in offspring resulting from sexual reproduction? A law of segregation B law of dominance C law of independent assortment D law of crossing-over

When can a primary succession occur?

Friction between a skateboard wheel and the surface produces?

What are two functions of the cell membrane

Why can eukaryotes carry out more specialized functions than prokaryotes can? A) eukaryotes have more organelles B) Prokaryotes have more organelles C) eukaryotes are bigger D) prokaryotes are bigger