Biology S1 Review '22

Front

What is competition between species?

Back

Competition between species occurs when two or more species compete for the same resources, such as food, space, or mates. An example is frogs and toads eating flies in a pond.

Front

What evidence supports the idea that organisms share a common ancestor?

Back

The similarity of structures among different organisms, known as homologous structures, suggests that they share a common ancestor.

Front

What are vestigial structures?

Back

Vestigial structures are remnants of organs or structures that had a function in an early ancestor but are no longer needed for survival. An example is the human appendix.

Front

What is the main difference between prokaryotes and eukaryotes?

Back

Eukaryotes have a nucleus, while prokaryotes do not. Prokaryotes are simpler, single-celled organisms, while eukaryotes can be single-celled or multicellular.

Front

What is a biomass pyramid?

Back

A biomass pyramid is a graphical representation showing the distribution of biomass among different trophic levels in an ecosystem.

Front

Which organisms have the least amount of energy in a biomass pyramid?

Back

Tertiary consumers have the least amount of kilocalories from the original energy source in a biomass pyramid.

Front

What are homologous structures?

Back

Homologous structures are anatomical features in different species that share a common ancestry, even if they have different functions.

Front

What are analogous structures?

Back

Analogous structures are features in different species that serve similar functions but do not share a common ancestry.

Front

What is natural selection?

Back

Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is the role of producers in an ecosystem?

Back

Producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of the food chain.