Which is a characteristic of all animals?
a. they develop from embryos
b. they reproduce only sexually
c. they are always motile
d. some are producers
e. some are unicellular
ANSWER: a
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In meiosis, cells become haploid ____
a. at the end of telophase I b. during metaphase I c. during anaphase I d. at the beginning of metaphase II e. at the end of prophase II
Which structure is not derived from mesoderm?
1.cartilage 2.blood vessels 3.epidermis 4.reproductive tract
When comparing the actual number of genes, the organism with the highest number is
A. rice. B. yeast. C. fruit fly. D. human.
Which of the following refers to the area of Earth's surface that is required to sustainably support a particular level of development and consumption?
A. Demographic transition model B. Carrying capacity C. Ecological footprint D. Biosphere E. Ecological cohort