1) Soil samples / collect / from three different places. (Simple Past) 2) The study area / divide / into four distinct zones. (Simple Past) 3) GPS coordinates / record / for each sampling point. (Simple Past) 4) Water quality parameters / measure / in situ. (Simple Past) 5) The experiment / conduct / in a controlled laboratory setting. (Simple Past) 6) The data / analyze / using R software. (Simple Past) 7) All specimens / preserve / in ethanol for later analysis. (Simple Past) 8) The satellite imagery / obtain / from the LANDSAT 8 database. (Simple Past) 9) A preliminary survey / carry out / to identify key areas of interest. (Simple Past) 10) The transects / establish / across the ecological gradient. (Simple Past) 11) A significant correlation / find / between nutrient levels and algal blooms. (Simple Past) 12) Elevated levels of mercury / detect / in the sediment samples. (Simple Past) 13) No significant difference / observe / between the control and treatment groups. (Simple Past) 14) The hypothesis / support / by the data collected. (Simple Past) 15) The final results / just publish / in the Journal of Ecology. (Present Perfect) 16) Several new species / identify / during the biodiversity assessment. (Simple Past) 17) The forest canopy cover / calculate / to be approximately 70%. (Simple Past) 18) The model / validate / using an independent dataset. (Simple Past) 19) It / show / that deforestation rates have increased. (Present Perfect) 20) The project / successfully complete / ahead of schedule. (Present Perfect) 21) This particular ecosystem / characterize / by high levels of biodiversity. (Simple Present) 22) The term "sustainability" / define / in various ways in the literature. (Simple Present) 23) Carbon dioxide / recognize / as a major greenhouse gas. (Simple Present) 24) The research / fund / by the National Science Foundation. (Simple Present) 25) Peer review / consider / essential for academic publishing. (Simple Present) 26) These methods / widely use / in environmental science. (Simple Present) 27) The area / designate / as a protected natural reserve. (Simple Present) 28) The impact of climate change / study / extensively. (Simple Present) 29) It / generally accept / that biodiversity is under threat. (Simple Present) 30) The journal / publish / on a quarterly basis. (Simple Present) 31) The original research plan / modify / due to unforeseen challenges. (Simple Past) 32) The equipment / not calibrate / correctly before the first trial. (Simple Past) 33) Several outliers / remove / from the final dataset. (Present Perfect) 34) The study / replicate / multiple times to ensure reliability. (Present Perfect) 35) Further research / need / to confirm these findings. (Simple Present) 36) The grant proposal / submit / for the next funding cycle. (Present Perfect) 37) Permission to access the site / grant / last month. (Simple Past) 38) The paper / already review / by two experts in the field. (Present Perfect) 39) The final report / write / but not yet submitted. (Present Perfect) 40) The samples / accidentally contaminate / during transport. (Simple Past)

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