2.Collect a 5-mL water sample at 8 am at a different location each day for 10 days.
3.Measure the amount of pesticide present in each sample using the same measurement tools.
After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not valid?
a. The amount of water collected each day was the independent variable.
b. The daily location for sample collection was not a controlled variable.
c. Pesticide measurements were the dependent variable.
d. The time of sample collection was not a controlled variable.
Answer:
D
Explanation:
The samples should not only be collected at 8am. Rather, they should be collected at different times of the day. Time is not a control variable, in this case, only the sample size is. Time of day can influence many factors that affect the pesticide levels in the samples hence the need to collect samples at different times of day too.
A)
consumers.
B)
decomposers.
C)
parasites.
D)
producers.
Answer:
Consumers.
Explanation:
Food chain may be defined as the sequential tropic food levels in the ecosystem. The organism eats other organism and itself being eaten by the other organism.
Producers are the organism that prepare their own food in the food chain. The frog eats insect. Here, the frogs acts as the consumer as it depends on the other organism for its food and eats directly plants and butterflies.
Thus, the answer is option (A).
getting smaller
moving away
moving closer which one plz
Answer:
Option (3)
Explanation:
In astronomy, the redshift refers to the shifting of the beam (spectrum) of light towards the light of higher wavelength. The red coloured light has the highest wavelength. This shifting of light is due to the doppler effect, which states that the wavelength of light changes when the light source and the observer are constantly in motion with respect to each other.
Based on this observation and many other scientific investigations, the scientists have concluded that the redshift data indicates the expansion of the universe, where the distant galaxies are moving constantly and rapidly away from us.
Thus, the correct answer is option (3).
Great question!
The dry season of Indonesia is an annual period of little or no rainfall, and this is one of many reasons why Indonesia is so hot in the dry season.
° I can't say all the reasons, but I'll tell you a few more.
The tropics of Indonesia is dominated by the tropical rain belt, which moves from the northern to the southern tropics and back each year.
The tropical rain belt lies in the southern hemisphere very roughly from October to March - That's a whole half-year! 6 months!
↑ ↑ ↑ Hope this helps! :D