How can we reduce the Disadvantages of Human-made Materials?​

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

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

What best describes emerging scientific ideas