Two characteristics used to define mammals include

a. mammary glands and scales.

b. mammary glands and hair or fur.

c. mammary glands and sweat glands.

d. sweat glands and a four-chamber heart.

Which system most likely interact and cause the severity of infections to vary?

Very long and large organic molecules called

Cutting down vast tracks of rain forest may result in a loss of all the following environmental effects, except which one? A) carbon dioxide sink B) stabilization of soil C) biodiversity D) profits for the timber industry

A tree grows and increases its mass. explain why this phenomenon is not a violation

Two birds who are identical twins (i. e., have exactly the same genotype), are raised in different zoos. One of them has a red crest as an adult and the other has a yellow crest.

Which type of fossil is bone or tooth that have been covered by layers of sediment and preserved into stone. Body Fossil Mold Fossil Resin Fossil Trace Fossil

What determines how many trophic levels a rain forest ecosystem can support?

Match the meaning to the word part

The process in late pregnancy when the fetal head begins to decend into pelvis.

Why can flowers rapidly germinate?