Answer: A
Explanation:
Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.
They're the only vein that carries oygenated blood
Answer: White Oak
White oak comprises 15% of the commercially available hardwoods in the US. It is a used for structural timbers, flooring, and furniture because<span> of its length (rees average approximately 70 to 80 feet in height), color (White with creamy sapwood and dark gray-brown heartwood) and texture (very strong and hard, and with good steam bending properties). It takes a good finish when machined, nailed and screwed well. </span>
A hypothesis<span> is an idea that </span>can be tested<span> by an </span>experiment<span>-These ideas are based upon a person's </span>observations and<span> previous knowledge or experience. </span>
Answer:
D, C and A are the correct options.
B is less likely rather is a personal reference.
