Excretion is the movement of substances from the ________ to the ________
A) filtrate... blood
B) kidney... urinary bladder
C) blood... filtrate
D) kidneys... outside
D
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Which statement is not true about conifers?
(a) Conifers are gymnosperms. (b) All conifers belong to the genus Pinus. (c) All conifers have naked seeds. (d) Conifers are heterosporous.
Answer the following statements true (T) or false (F)
1. If a cell contains 20 units of DNA during G2, it will have 40 units of DNA during S. 2. During prometaphase, the sister chromatids organize into a single row in the center of the cell. 3. A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid. 4. One major difference between metaphase I and metaphase II is the presence or absence of bivalents. 5. Sexual life cycles include both haploid and diploid stages.
Parasitism is often a ____________ factor affecting populations.
A. density-independent B. density-dependent C. inverse density-dependent D. cyclic E. random
Which of the following is not a predicted response to climate change due to global warming?
1.Changes of geographical distribution in populations, species and communities. 2.Distribution of polar species will contract to higher latitudes. 3.Lowland species will move to higher elevations. 4.All of these changes have been predicted.