Describe at least four ways in which the cns is protected.

What direction does a diffusing substance move?

Nervous system develops from? a. ectoderm b. endoderm c. mesoderm d. trophoblast e. blastocyte

How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?

If one strand of dna had a base sequence of a-t-t-g-c-a, what base order would be found on the complementary strand of dna?

In which way will energy be used after it leaves the mitochondrion during cellular respiration

Which example is an organism? A. bacteria B. heart C. clay D. soil

What are some examples of a chemical reaction?

If you continue to increase the intensity of light that a plant receives, what happens? A. The rate of photosynthesis increases indefinitely with light intensity. B. The rate of photosynthesis decreases indefinitely with light intensity. C.

Three structural changes that occur in young unmodified plant cells as they develop into xylem tissues

Which of the following statements about Polymerase Chain Reactions is wrong? (A) DNA is briefly heated to break the hydrogen bonds holding two strands together.