Which of these can be described as a system of stars, gases,

dust, and other matter that orbits a common center of gravity?

a. an asteroid

b. a galaxy

c. a nebula

d. a comet

What is membrane-bound nucleus

What charactaristics are used to classify bacteria as archaebacteria or eubacteria

Covalent bonds do not gain or lose electrons, but rather share electrons. True False

A student argues that two species of birds are the same species because they have similar body structures, similar DNA, and similar beaks.

The formation of karst topography requires carbonic acid react with?

The greenhouse effect is related to the increase in average surface temperatures known as

Which of the following is true about spring tides but is not true about neap tides? they must occur during a new moon in spring they occur during the moon's first quarter and third quarter phases they only occur during a full moon they can occur

Animal cells are bathed in an isotonic fluid, and plant and bacteria cells have a cell wall. What does this protect the cell membrane from?

Explain why latin is the basic for many scientific names

What is incomplete penetrance and what causes it? incomplete penetrance means the heterozygote has an intermediate phenotype between the two homozygous phenotypes because of interactions with environmental factors.