The first known multicellular organisms evolved approximately how many years ago?
A. 3.5 BYA
B. 1.4 BYA
C. 2.1 BYA
D. 100 MYA
Answer: B
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Microbes such as Geobacter metallireducens obtain energy from organic matter under anaerobic conditions by using ferric iron as a(n) ________.
Fill in the blank(s) with the appropriate word(s).
What is the pollen to ovule ratio of the species A plant?
a. 10 b. 100 c. 1000 d. 10,000,000
Type II survivorship curves
a. are characteristic of humans and elephants. b. indicate a fairly constant rate of death at all ages. c. indicate a high mortality rate in the very young. d. are characteristic of species in which most individuals live a relatively long life and die of old age. e. are typical of species with high biotic potentials.
In sexual reproduction in humans ________.
A. haploid sperm fertilizes a haploid egg cell B. two diploid gametes are combined to produce a zygote C. a haploid individual is produced D. an individual with 44 chromosomes is produced