BLG 144 Midterm 1 (2024) Questions With 100%Correct Answers.

BLG 144 Midterm 1 (2024) Questions With 100%Correct Answers. What is the theory of special creation - - all species are independent -life on earth is young-6000 yrs old -species are immutable typological thinking - based on idea that species are unchanging types and that variations within species are unimportant/misleading great chain of being - Aristotle believed that there's a ladder of nature that orders based on increased size and complexity (humans are at the top) Lamark's theory of "change through time" and "inheritance of acquired characters" - proposed a theory of evolution that species are not static but change through time -always producing larger and more complex or "BETTER" species -individual's phenotype changes as challenges in the environment get passed on to the offspring (ex. giraffe have begin to have long necks for eating higher trees and now offspring has long necks) Darwin's theory of natural selection - -species are not static, they change through time descent with modification - -Darwin proposed that species in the past are ancestors of species existing today 1. species change through time 2. species are related by common ancestry. how old is the earth - around 3.4-3.6 billion years ago, life was formed earth per se is about 4.6 billion years old transitional feature - trait in a fossil that is intermediate between older and younger species ex. aquatic animals with fins transition to terresterial animals with limbs fossil - any trace of an organism that lived in the past fossil record - all fossils found and recorded -indicates that over 99% of all species that have ever lived are now extinct geological time scale - sequence of named intervals called eons, periods, eras, that represent major events in earth's history tetrapods - 4-fotted vestigial traits - reduced or incompletely developed structure with no function or structures in closely related species ex. tailbone in humans -evidence that species have changed through time homology - study of likeness .