B. Terrestrial and Aquatic
They are rich in hydrogen and helium, they have unlimited supply of hydrogen, they have a strong gravitational pull.
Explanation:
Space where huge size of gaseous and dust cloud is present is called nebula. It is mainly made of hydrogen and helium. Nebula exist in the space which is between the stars and it is call as interstellar space.
Helix nebula is closest nebula which is near the earth. It’s distance from earth is about 700 light years.
Dark nebulae are very dense as well as cold. Nebula can be divided into dark nebula and bright nebula. The gas which is present between the stars is always combine with solid grains cosmic dust.
Answer:
This sounds like you need interactive materials to complete?
Explanation:
The bottom says this: <em>Using only the reactants you have already constructed, create the products of cellular respiration. Use your student reference sheet to refer to the structures of the two products.</em>
Answer:
decreases amount of energy necessary for reaction to proceed
Explanation:
they lower activation energies of the reactions they catalyse
