10 points
4. Puberty begins when the hypothalmus signals the pituatary to release
follicle-stimulating hormone (FSH) and luteinizing hormone (LH). During
this process, which systems are primarily interacting?
immune, reproductive, and nervous systems
circulatory, integumentary, and excretory systems
reproductive, endocrine, and nervous systems
excretory, reporcuctive, and endocrine systems

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.