Based on the phylogeny shown, we can conclude that species 2 is most closely related to species
A. 1
B. 3
C. 4
D. 5
E. 1 or 3 (can't tell)
Answer: B
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In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development
The stage where the developing frog arrests depends on the species involved in the cross. This is an example of A. hybrid breakdown. B. hybrid sterility. C. hybrid inviability D. sexual isolation.
When rapid speciation produces a cluster of closely related species that occupy different habitats or consume different
foods, the process is referred to as ____.
a. punctuated equilibrium b. disjunct dispersal c. disjunct vicariance d. adaptive radiation e. continuous vicariance
Reduction of environmental temperatures to freezing rapidly leads to cell death as a result of ____
a. inhibition of cell division b. inhibition of molecule transport across the cell membrane c. increased cellular signaling d. increase in metabolic reactions e. decreased lipid synthesis
Which of the following are true about ecosystems? Check all that apply.
_____ They contain both living and nonliving components. _____ There is a transfer of energy through the system and some energy is lost as heat energy. _____ Nutrients repeatedly cycle through the ecosystem. _____ They represent the lowest level of biological organization. _____ The ultimate source of energy for most ecosystems is the sun.