Which of the following statements is true? evolution is like a ladder, with humans at the top and unicellular organisms at the bottom. macroevolution cannot be observed directly. it is based on fossils and historical evidence. human embryos do not share any characteristics or features with other vertebrate animal embryos. evolution gives organisms what they need to survive.

Calvin ate a candy bar, which caused his body's blood glucose levels to become unbalanced. his body responded by initiating a feedback mechanism to return his body to homeostasis. place the steps of this feedback mechanism in order, starting with the blood glucose imbalance that occurred after calvin consumed the candy bar. a) calvin's blood glucose levels decreased. b) calvin's pancreas stopped secreting insulin. c) calvin's body cells started to take up glucose and store it as glycogen. d) calvin's blood glucose levels increased. e) calvin's pancreas started secreting insulin.

In the diagram below, which organelle is a ribosome, which combines amino acids and produces proteins? оооо

What would be he the strand of complementary dna produced be the strand of dna shown below> tcg aag