Biology Test 4
Whew! Another A!! Yes! Pretty happy with how Biology II has been going - it’s actually very interesting since we’re learning about life at the anatomy/physiology level these days. It’s amazing how you don’t ever think of things like “Do fish drink water?” “Does insect blood contain oxygen?” “Do birds mix their inhaled air & exhaled air?” “Do earthworms have a complete digestive tract?” It’s just fascinating to see on how many levels we have commonality with the living creatures around us - in short life truly is life in more aspects than we realize. As my professor says… a potato is really good at being a potato - the same statement would hold true for all animal species as well. We have learned to adapt to use our adaptations or we adapted to suit our lifestyle, no matter how you look at it - it’s all evolutionary at an elementary level. I know you are curious, so I will answer the questions posed; Marine fish do in fact drink water (lots of it) while freshwater fish don’t, Insect blood does not contain oxygen, it’s hemolymph and it’s just nutrients, Birds have air-sacs and because of those they never have to mix inhaled air with exhaled air, keeping the highest levels of O2 available for them at all times and Yes, an earthworm (annelid) has a complete digestive tract - complete with mouth, pharynx, esophagus, crop, gizzard and intestines. Now aren’t you glad you read this post? 