Earthworms have 1. Circular and Longitudinal muscles that help them move. These muscles work together to adjust the thickness/thinness of the worm (circular) and longness/shortness of the worm (longitudinal). The muscles contract and expand, allowing the worm to move somewhat like a wave.
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
Will mark brainliest if correct/available! which of the following statements is true? all plants need flowers to sexually reproduce. sexually reproduced offspring are identical to their parents. fertilization always occurs inside the female's body. a body cell has twice the number of chromosomes as an egg cell.
Plz ! a scientist wants to produce a cow that makes a particular human protein in itβs milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.