The process in flowering plant reproduction in which the first sperm unites with an egg to form a diploid zygote and the second sperm unites with two haploid polar bodies to form the diploid endosperm is called double fertilization
Indicate whether the statement is true or false
FALSE
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Circulatory systems
a. are found in all animals. b. result in slow distribution of nutrients and gases. c. include one or more hearts. d. are always closed systems. e. are all of these
What kind of pathogen would retain its ability to cause infections after being treated with powerful proteolytic chemicals that would destroy all proteinaceous material?
A. A viroid B. A bacterium C. A fungus D. A virus E. A prion
Which of the following was a significant new challenge plants faced in moving to land that they had not faced in their aquatic environment?
a. predation b. desiccation c. the need for osmotic regulation d. light availability e. nutrient availability
Which organism does not contain kidneys?
A. lizard B. hummingbird C. rabbit D. shark E. beetle