How might the increase in sea otters change the growth patterns of other species?

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

How do you transfer mrna into codons ? i'm so confused : (

Which type of respiration takes place when there is no oxygen present