11. Which type of ecosystem is the most productive? river
coral reef
tropical rainforest
deciduous forest
desert
swamp
farm field

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

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d. a round-trip ride to school and back

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.