The mass of helium gas in a balloon is . the weight of the gas minus the balloon
the amount of matter inside the balloon
the amount of matter including the balloon
the mass of helium minus the mass of the balloon

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Azoologist is studying four very closely related feline species. she wishes to compare their gestation periods. an observational study is conducted where the zoologist observes the gestation period of 50 randomly selected felines in each species. a one-way anova test is run to test the hypothesis that the average gestation period is the same for each of the four species. a level of significance of 0.05 is used, and a p-value of 0.01 is calculated. based on this result, the conclusion that can be drawn is that:

Kendra has the ability to cover a distance in a short period of time. she is said to have a lot of agility power strength