The first leaves produced by an embryo while still inside the seed are

A) cotyledons. B) epicotyls. C) coleoptiles. D) endosperms. E) embryo sacs.


A

Biology & Microbiology

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Thalassemias are associated with a(n) ____

a. amino acid substitution b. extended chain in beta globin c. imbalance in the production of alpha or beta globin d. excessive synthesis of beta globin e. altered rate of oxygen transport

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Which of the following is a major limiting factor that affects how many steps are in a food chain?

a. food b. habitat c. predators d. energy

Biology & Microbiology

Which process in Paramecium results in genetic recombination but no increase in population size?

A) budding B) meiotic division C) conjugation D) binary fission

Biology & Microbiology

When oxygen became part of the atmosphere, it came from 

A. carbon dioxide. B. volcanoes. C. the splitting of water by autotrophs. D. organic molecules.

Biology & Microbiology