What is carrying capacity? Has the human population exceeded Earth's carrying capacity for humans? If so, how could this have happened?

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

How does a gymnosperm prevent itself from pollinating the same tree

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra