The correct answer is the second option. Animals have two major types: vertebrates and invertebrates. Vertebrates are animals that have backbone while the invertebrates do not have one. Examples for vertebrates are birds and mammals while the latter are insects and squid.
50% probability that a human sperm cell will carry an X chromosome
Answer: c) biologists would track the number of species and their relative abundance in the gulf coast region in 2009, 2010, and 2011
The correct answer for the question is A. Diffrences in heating
