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“One mammal uses echo-location in order to navigate in its environment and to find food. Which mammal?”
Of course, this is the bat.
In the preface of “Selection No. 2 from Transformations of a Bat”, en e-book I published in 2012, I wrote:
“[...] In terms of ability to manoeuvre it [the bat] is the best flier of the fauna. Considering that it is almost blind and can hunt, follow, and catch flying insects by echo location, it is impossible not to be impressed by its perfect adaption to being an insect eater as well as a night-living creature.
Some bats eat fruit. While navigating through the branches of fruit trees by echo sound is not as hard as following a flying insect, it is still an amazing feat. One species drinks blood, and that, naturally, is why people have come to associate bats with vampires.
It would be interesting to know how the brain of a bat represents the result of this echo location, whose nervous impulses must be reflex-bound to be able to direct the muscular system and thus its manoeuvres in fractions of a second. Is there any conscious registration of this at all? Do bats even have a consciousness in any sense of the term? We will never find answers to such questions, confined as we are within our own consciousness. [...]”
“When Carl was one year younger than John was when Henry was half as old as John will be 3 years from now, Henry was twice as old as John was when Henry was 1/3 as old as Carl was 3 years ago. But when John was twice as old as Carl, Henry was 1/4 as old as John was one year ago. Carl is over 50.
How old are Carl, John and Henry?”
Carl is 72, John is 85, Henry is 80.
Aimure and Esp130 gave right answers to quiz 1-3. But before that, TheGuy correctly answered quiz 1-2.
And now some new exercises for brain & memory... This time we take only quizzes, but a few more than usually.