When zinc is placed in hydrochloric acid (HCl). hydrogen gas and zinc chloride are produced. How many grams of HCl would need to react to produce 3.21 grams of hydrogen gas? Zn + 2HCl --> ZnCl2 + H2 a 115.88 g HCl b 84.83 g HCl c 28.38 g HCl d 42.42 g HCl

What is the next step in muscle contraction after the actin changes shape? (apex)

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

What organ is the first to receive nutrients that have been absorbed from the digestive tract?