Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are

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#Question id: 11515

#Section 2: Evolution

The statistical study of populations is called

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#Question id: 12149

#Section 1: Ecology

In a discrete-time population model, which of the following behaviours is associated when 1 < r < 2? 

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#Question id: 3287

#Section 2: Evolution

Which statement is not an assumption of the Hardy–Weinberg law?

a. The allelic frequencies (p and q) are equal.

b. The population is randomly mating.

c. The population is large.

d. Locus is di-allelic

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#Question id: 10653

#Section 1: Ecology

All offspring are produced in a single reproductive event, we term this pattern semelparity. Which of the following is characteristics feature for semelparity individuals?

a) Semelparity is common in insects and other invertebrates

b) Semelparous organisms may live for many years before reproducing

c) semelparity occur only in plant

d) In semelparity, exploitation competition is more common than interference competition

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#Question id: 12094

#Section 1: Ecology

Which of the following plant groups is now extinct?