Playing the piano requires activation of muscles of the upper limbs, neck and back. to play the keys, the fingers must generate rapid, small movements that vary in force generation to play the keys sometimes very hard (larger amounts of force) and sometimes very soft (very little amounts of force), and everything in between. the elbow flexors hold the elbow joint at the same comfortable angle throughout the duration of play, which can last several hours. additionally, the player must also sit upright at the piano bench for these long durations without the back or neck muscles fatiguing. a. lactic acid is produced because no oxygen is available to the muscle cell. b. lactic acid is made when atp demands exceed oxygen availability in the cell. c. lactic acid is a byproduct of creatine phosphate production. d. lactic acid is made when there is insufficient glucose in an active cell

Which prevent errors in dna replication? a. helicase enzyme checks the dna for errors. b. each base can attach to only one other type of base. c. ribosome enzymes prevent errors from happening. d. dna contains no complementary base pairs.

An easy way to calculate the amount of energy available at each level is to what?

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.