All of the following are traits of echinoderms except

a. five-part radial symmetry.

b. a pair of antennae.

c. tube feet.

d. an internal skeleton.

Why are hydrogen bonds and van der Waals interactions necessary for cells?

The part of the atom that has a positive charge is?

What kind of change occurs when ice becomes liquid water? A. substance change B. physical change C. melting reaction D. chemical change

Leak channels and sodium-potassium pumps are present on the cell body, dendrites, axon and terminal ends of the neuron cell membrane. A. True B. False

In RNA molecules adenine is complementary to

Where can you find carbon inside an organism?

How did the grants test their hypothesis that differences in birds' songs can keep different species of finches from breeding with one another? how di

Which occurs during digestion? The mouth only allows for physical digestion. The mouth only allows for chemical digestion. Chemical digestion prepares the food for physical digestion. Physical digestion prepares the food for chemical digestion.

What would provide the body with the most energy? A. breaking a double carbon bond B. creating bonds to form a nucleic acid C. forming bond between lipids D. breaking the bonds in a polysaccharide

What type of electromagnetic wave is used in security pens?