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A number of factors may be involved, and one possible cause may be the effects of agricultural pesticides and herbicides. Several studies have shown that many of these pesticides and herbicides tested at the concentrations usually found where the amphibians live the University of California at Berkeley looked further into this problem to determine hether these agricultural poisons can affect the amphibians without necessarily killing them.
He focused on atrazine, the most widely used herbicide in the world and a common contaminant in fresh water. Every year more than 70 million pounds of atrazine are applied to farmland in the United States alone.
Atrazine is applied to farmland in the spring, when many amphibians are breeding and thousands of tadpoles swim in the ponds and streams that receive runoff from farms, contaminated with atrazine. In their laboratory Hayes and his associates looked at tadpoles of leopard frogs, species Rana pipiens.
They hatched the eggs and the tadpoles were separated into 6 separate tanks. · BIO M – Ecology, Evolution, and Society NAME _____ EXAM THREE 5 MAY 1 1. Chloroplasts and mitochondria are examples of _____. a.) endosymbionts b.) eukaryotes c.) cells d.) Protista e.) parasites 2.
The following represents which type plombier-nemours.com · Keystone Exams: Biology ASSESSMENT ANCHOR BIO.A.1 Basic Biological Principles Anchor Descriptor Eligible Content Enhanced Standard BIO.A Explain the characteristics Sample Exam Question Standard BIO.A Which statement best describes an effect of the low density of frozen water in a lake?
A. When water freezes, it contracts, plombier-nemours.com pdf. You can use the free response questions and scoring guidelines below as you prepare for the AP Biology.
Below is our collection of free VCAA-style practice exams for VCE Biology. Every Engage Practice Exam can be identified by a unique letter printed on the front cover of the exam, be sure to download the correct solutions for the exam you have plombier-nemours.com plombier-nemours.com - Your free, practice test site for a Free, Practice AP - Biology* Exam.
In addition to the AP Biology Practice Tests and AP Biology tutoring, you may also want to consider taking some of our AP Biology Diagnostic Tests. The AP Biology exam is divided into two sections.
The first section consists of 63 multiple-choice questions and 6 mathematical grid-in responses.