Which of the following adaptations is characteristic of crocodiles?
a. scaly skin
c. four-chambered heart
b. ectothermic
d. all of the above

Witch type of microscope is used to view very small cell components like proteins and dna?

Afamily has a y-linked disease that affects the father. what is the chance of a male offspring inheriting the same disease? oa. 100% ob. 50% oc. 25% d. 0%

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.