2. A barrel floats down a river past two flags that are 100 meters apart. The time it took for the barrel to pass each flag is shown. What is the speed of the stream's current?
2:15
2:43
O A 0.28 m/s
OB.22 m/s
OC. 24 m/s
OD.3.6 m/s

Which best summarizes the finding of avery? a. some traits are recessive. b. humans reproduce sexually. c. dna is a transforming factor. d. traits cannot be inherited.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins