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How did evolution ever lead ostriches to hide their head in the sand when an enemy approaches? Also please follow my profile.

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Related questions

In class we talked about the differences between semelparous and iteroparous life histories. Read the article Semelparity and Iteroparityand answer the questions that follow.

(1) Since evolution tends to maximize total reproductive output during the lifetime of a species, how could programmed death after the initial reproductive event ever be favored? Hint: see Figure 3, schematic of demographic model.

(2) Bet-hedging models predict that evolution should favor iteroparity when adult survival is highly variable. Why? Is such a model supported by available evidence? Explain with an example.

(3) What is meant by a species “approaching” semelparity?

(4) Are grain crops mostly semelparous or iteroparous? Why?

The link:

http://www.nature.com/scitable/knowledge/library/semelparity-and-iteroparity-13260334

http://www.nature.com/scitable/knowledge/library/semelparity-and-iteroparity-13260334

In class we talked about the differences between semelparous and iteroparous life histories. Read the article Semelparity and Iteroparityand answer the questions that follow.

(1) Since evolution tends to maximize total reproductive output during the lifetime of a species, how could programmed death after the initial reproductive event ever be favored? Hint: see Figure 3, schematic of demographic model.

(2) Bet-hedging models predict that evolution should favor iteroparity when adult survival is highly variable. Why? Is such a model supported by available evidence? Explain with an example.

(3) What is meant by a species “approaching” semelparity?

(4) Are grain crops mostly semelparous or iteroparous? Why?

QUESTION 3

Which of the following would NOT be a good method for sortingout the evolutionary relationships between a parrot, gorilla,hippopotamus, starfish, and catfish?

comparing the skeletal anatomy

examining the habitat in which these organisms live

looking at embryos for common developmental patterns

comparing the nucleotide sequence divergence of selectedgenes

all of the above would provide useful information

10 points

QUESTION 4

Which of these habitats should have the highest number ofendemic species (found there and nowhere else).

grasslands of the central United States

Hawaiian islands

Amazonian rainforest basin

Mississippi river

10 points

QUESTION 5

Darwin's concept of evolution "the theory of descent withmodification through variation and natural selection" can bedemonstrated by which of the following examples?

A giraffe stretches his neck to reach higher branches. Theexercise of stretching up strengthens the muscles in the neck andlegs. This ability to stretch is also seen in the giraffe'soffspring.

A monkey accidently drops her fruit in the salty water of a bay,she recovers the fruit and eats it. She discovers that the fruit iscleaner and tastes better after it has been in the salty water. Shecontinues to wash fruit in the bay before eating. Her offspring seewhat she has done and also wash their fruit in the salty water.Soon the whole population is washing their fruit

Several turtles hatch from a clutch of eggs buried in the sandon a beach. One of the turtles is the color of the sand, the othersare darker in color. The turtles all scurry to the water, but oneby one the dark turtles are eaten by birds, only the sand coloredturtle survives. When it enters the water the sand color changes toa darker brown. The turtle grows, mates and has offspring that arealso sand colored when they are born

A female alligator gives birth to a male alligator that has theability to change color to a bright white when it is in cold water.The baby male alligator is quickly spotted by a large bird of preyand eaten

10 points

QUESTION 6

During the Beagle journey, Darwin visited islands,allowing him to compare island species with continental species. Interms of framing his theory of evolution, why was thissignificant?

Because the island species had both similarities to theircontinental ancestors and unique adaptations to their islandenvironments

Because the island species no longer shared traits with theircontinental ancestors

Because the species he saw on the islands had not changed fromtheir ancestral continental form

Because the island species had very low reproductive andsurvival rates as compared with their continental ancestors

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