Rattlesna Essay
READING MATERIAL 1. Explain the three hypotheses for the recent changes in the toxicity of venom in different species of rattlesnakes found in the United States. - Interbreeding between snakes with different venom profiles. - Geographic distribution (genes shifted eastward) - Convolution - Old rattlesnakes have high concentration of toxic. 2. What is an “evolutionary arms race”? Describe how this applies to one of the hypotheses suggested to explain toxicity of venom in rattlers – i.e. Using the 3 specific requirements for natural selection, discuss how rattlesnake venom toxicity could increase due to an arms race. Variation, inheritance, deferent reproduction. In variation, high level of toxic will survive and produce
…show more content…
• patrol, drive off intruders
• carry to good feeding spots
• build small shelters
• store treehopper eggs in own nests
Wasps & Caterpillars: parasitic wasp grubs inside caterpillar host
Brood Parasites: cowbirds lay their eggs in their nests 40. What is the Geologic Time Scale? It is what the geologists developed as a model of the history life of Earth. Eons are the largest subdivision of geologic time. Eons are broken down into smaller units called Era. Today we are living in the Phanerozoic Eon and the Cenozoic Era. 41. When was the Hadean Eon? What characterized it? 4.56-3.8 Ga. Earth was bombarded by meteorites which prevented life from evolving. 42. What were early Earth conditions like? How do scientists know this? Earth was bombarded by meteorites. From the meteorites and because the moon is part from the earth and the moon has big holes that the earth now does not have it, and only has some remaining meteorites. 43. How was the moon formed? Mars-sized body collides with the earth. (it was a part from the earth and exploded) 44. What is the oldest known material on Earth? How old is
• patrol, drive off intruders
• carry to good feeding spots
• build small shelters
• store treehopper eggs in own nests
Wasps & Caterpillars: parasitic wasp grubs inside caterpillar host
Brood Parasites: cowbirds lay their eggs in their nests 40. What is the Geologic Time Scale? It is what the geologists developed as a model of the history life of Earth. Eons are the largest subdivision of geologic time. Eons are broken down into smaller units called Era. Today we are living in the Phanerozoic Eon and the Cenozoic Era. 41. When was the Hadean Eon? What characterized it? 4.56-3.8 Ga. Earth was bombarded by meteorites which prevented life from evolving. 42. What were early Earth conditions like? How do scientists know this? Earth was bombarded by meteorites. From the meteorites and because the moon is part from the earth and the moon has big holes that the earth now does not have it, and only has some remaining meteorites. 43. How was the moon formed? Mars-sized body collides with the earth. (it was a part from the earth and exploded) 44. What is the oldest known material on Earth? How old is