Robert is 25 years old. He wishes to maintain his cardiorespiratory endurance by swimming 25 laps 2x per week and biking for 30 minutes 2x per week. When he swims his heart rate is 135 bpm. When he bikes his heart rate is 110 bpm. • Calculate his maximum heart rate.

• Calculate his target heart rate (Threshold/Ceiling).

• Which exercise should he do more of to maintain his cardiorespiratory endurance. Why? How can he intensify the other exercise to elevate his heart rate past his threshold?

Which of these is most likely to prevent pregnancy? a. tracking of female body temperature to identify ovulation times b. proper condom use c. male withdrawal before ejaculation d. proper spermicide use

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

Traffic patterns refer to: how you move through a space hallways how rooms are connected to each other how rooms are organized