Germany is a very affluent European nation, so we would assume that its ecological footprint would most likely be ________
Fill in the blank(s) with correct word
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Genes that specify the final identity of a body region are called _______
A. bicoid B. homeobox genes C. homeotic D. lineage genes
Answer the following statements true (T) or false (F)
1.Freshwater fish lose water by osmosis. 2.Saltwater fish lose water by osmosis. 3.Countercurrent exchange is used for homeostasis both by some animals experiencing cold conditions and by kidneys in the nephron loop. 4.Dilation of blood vessels in extremities can help animals lose excess heat as part of thermoregulation. 5.One reason for homeostasis in body temperature is that excessively high temperature can lead to protein denaturation and loss of protein function.
In humans, identical twins are possible because _____
A) cytoplasmic determinants are distributed unevenly in unfertilized eggs B) extraembryonic cells interact with the zygote nucleus C) early blastomeres can form a complete embryo if isolated D) the gray crescent divides the dorsal-ventral axis into new cells
Which of the following statements regarding the currently available fossil record is false?
A) The currently available fossil record shows that the earliest fossils of life are about 3.5 billion years old. B) The currently available fossil record shows that younger strata were laid down on top of older strata. C) The currently available fossil record documents gradual evolutionary changes that link one group of organisms to another. D) The currently available fossil record shows that the first life-forms were eukaryotes.