Type of vegetation Grasses Shrubs Trees Total species 1 32 0 0 32 Years after clear-cut logging that the area was sampled 5 15 25 45 28 4 0 32 5 0 29 31 8 16 55 35 18 24 77

Which is an example of secondary succession? Mark only one oval. A) Beach grasses colonize a newly formed sand dune. B) Retreating glaciers leave alluvial soils for cottonwood trees to colonize. C) A shift in river flow introduces sediment to a rocky area. D) A farmer allows an agricultural field to return to native grassland. An old pine tree in someone's front yard is beginning to die as the neighborhood deciduous trees have grown in abundance and size. Based on the ideas of the concept of succession, why might this be? Mark only one oval. A) Deciduous trees have depleted the soil of nutrients. B) The pine tree is shade intolerant. C) The pine tree has depleted the soil of nutrients. D) Deciduous trees are shade intolerant. E) Salt water most likely has intruded the area The number of species within a community is usually greatest when which of the following occurs? Mark only one oval. A) no disturbance occurs. B) a low frequency of disturbance occurs. C) an intermediate frequency of…

37. a)How many TERRESTRIAL  ecosystems have the World Wildlife Federation  identified so far? b)How many of these are in Canada? c)List three different AQUATIC ecosystems found in Canada?

I’m having hard time understanding this question of which answer would be correct can you please help?

Summarize how areas affected by wildfire have bounced back biologically in 2 paragraphs. What are the steps of succession seen (what plants grew in first, second, etc.)? You may also include pictures. (HINT: Pick a CA wildfire from a few years ago so there is documentation to assist you).

Which of the following is an example of the founder effect?    a.) Northern elephant seals were hunted to near extinction, but populations later rebounded.            b.) None of the answers are correct            c.) A plant seed established a new population after hitching a ride on a migratory bird            d.) All of the answers are correct            e.) A late frost killed 95% of a local population of spring ephemeral plants

From your reading of the short article "Why Fish Need Trees and Trees Need Fish" by Anne Post, how much streamside (riparian) vegetation is marine-derived originating from migrating anadromous Pacific salmon? about 10-15% 000 0. about 25%, but other researchers report as much at 70% about 10%, but other researchers report as much at 25% 45%, but other researchers report as much at 75%

8)Which of the following questions would be considered ecological questions? choose all that apply a)How does the availability of rainfall affect pollen production in mulberry trees? b)How do the population dynamics of hawks affect the population dynamics of lizards? c)How does elevation affect the amount of rainfall? d)How did the mouse species present in the Mojave Desert arise? e)How does a mutation in a gene for amylase affect nutrient absorption in white-tailed deer? f)None of these are ecological questions