What are the sources of modern antibiotics, and why does it make sense that these organisms would produce antibacterial toxins?

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

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 these statements are true about scientific theories and hypothesis