Explanations for mass extinction include all of the following except

1.collisions between the Earth and other bodies in the solar system.
2.continental movements.
3.adaptive radiation of new predator species in many lineages.
4.alterations in sea level.
5.habitat destruction.


3

Biology & Microbiology

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Which of the following is the specialized junction between neurons where signals pass between them?

a. node of Ravier b. axon hillock c. synapse d. dendrite

Biology & Microbiology

The animal in the above photograph was

adversely affected by ____ and is making a comeback thanks to ____. a. global cooling; heat producing chemical added to their diet b. sexually transmitted viruses; a new vaccine c. limited number of natural cavities; artificial nesting boxes d. high incidence of males being born; transplantation of females from other areas e. all of these

Biology & Microbiology

Muscle that is striated and voluntary is ____

a. skeletal only b. smooth only c. cardiac only d. both skeletal and cardiac e. both cardiac and smooth

Biology & Microbiology

A virus is a noncellular infectious particle containing nucleic acid. Which type of nucleic acid listed below can be found within viruses?

A) ssRNA B) dsRNA C) ssDNA D) dsDNA E) all of the above

Biology & Microbiology