Urban lake pollution is one of the serious issues due to suffering of waste discharged from householders. However, there is a gap of knowledge about the diversity of zooplankton species and how metals accumulate in zooplankton in urban ecosystems. We addressed this by determining the rule of blooming macro-zooplankton in Truc Bach lake and levels of two essential metals: copper (Cu), and zinc (Zn) and of three non-essential metals: arsenic (As), and lead (Pb) in water samples were determined. The results showed that Cladocerans and copepods are macro-zooplankton dominant species in Truc Bach Lake. Water temperature significantly affects the variety of copepod blooming. Arsenic concentration in water collected from the lake exceeded the safety level of current Vietnamese regulation. As concentration in macro-zooplankton positively correlated with metal concentrations in the water (p < 0.05) while the concentration of Cu, Zn, and Pb in water has no significant correlation with the metal in zooplankton’s body. The relative abundance of adult copepods in Truc Bach lake had a negative correlation with As concentration in water (p = 0.01). The higher As concentration in water, the lower relative abundance of copepods was found in the sample.

Modern civilization is undergoing tremendous change at a breakneck pace, bringing both possibilities and difficulties to our everyday existence. Under these conditions, youngsters, particularly undergraduates, are frequently confronted with situations requiring them to make a choice. The ability to make decisions about many aspects of social life includes the following: medical, health, sexuality, mating, and professional route. As a result, education in decision making skills is critical in our era. This study was conducted with the major aims was to explore the differences in undergraduates’ attitude towards decision making skill regard of their genders and academic years. 697 individuals were randomly recruited from six colleges around the country using a random sample approach. According to the findings of our study, there was no statistically significant difference between the views of males and females, nor was there a statistically significant difference between the attitudes of freshmen and seniors.   Received: 19 June 2022 / Accepted: 20 August 2022 / Published: 2 September 2022