atch the statement to the following options. A. One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg. B. Several X-shaped structures may be visible under the microscope and indicate where crossing over has occurred. C. A lattice of protein holds two replicated chromosomes in precise register with one another. D. Four chromatids are held together by a zipper-like structure. E. A process in which pairs of homologous complex chromosomes line up side by

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.