Ascientist wants to test how much of an acid can be added to a solution before
the ph of the solution changes to below a certain point. the starting ph of the
solution is 6.0, and the scientist wants to know when the ph of the solution
changes to below 4.0.
which ph indicator should the scientist use?
a
cresol red, which changes from yellow to purple around a ph of 7.2
b. thymolphthalein, which changes from colorless to blue around a ph of
9.3
c. methyl yellow, which changes from yellow to red around a ph of 4.0
d. methyl violet, which changes from violet to yellow around a ph of 2.0

When creating a graph, the goes on the x axis and the goes on the y axis. a. dependent variable, independent variable b. experimental group, control group c. independent variable, dependent variable d. control group, experimental group

Sea levels are rising due to climate change while increasing numbers of people are moving into coastal areas. to accommodate more people, there has been increased construction of beachfront resorts and condominiums. how is this impacting sea turtle numbers and biodiversity and why? a. the increased human population in coastal areas has meant that more food is available to the turtles (e. g., dropped food, waste from restaurants), which has led to an increase in the numbers and diversity of sea turtles. b. there has been very little change in the numbers and biodiversity of sea turtles because the planet is so vast that they can simply relocate to less crowded beaches. c. this has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction. d. this has resulted in an increase in numbers and diversity of sea turtles because people are around to protect them from natural predators.

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