12. In what direction does blood flow through the heart? A. Up and down
B. Right to left
C. Slow then fast
D. Fast then slow

Darius is observing a family of geese, which includes a male goose, female goose, and several goslings. when a dog approaches the geese, the male goose hisses at the dog and flaps its wings threateningly. is the behavior of the male goose an example of an adaptation?

Differences between compact bone and cartilage

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?