A kayaker travels a distance 4,550 meters with a speed of 3.5 m/s. How much time does it take him? 21 seconds
21 seconds

2000 seconds
2000 seconds

1300 seconds
1300 seconds

1000 seconds

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a.the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

Nucleic acid certain protein cell membranes certain carbohydrates