Organs are made up of ________ type(s) of tissue.

A. Two or more
B. Two
C. One
D. At least five


Answer: A

Biology & Microbiology

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Embryonic development begins with a single egg fertilized by a single sperm forming a zygote. The

zygote then undergoes mitosis; how many cells would be present at the conclusion of 4 mitotic divisions?

a. 2 b. 4 c. 8 d. 16 e. 32

Biology & Microbiology

In flowering plants, one sperm nucleus fuses with an

egg nucleus, and a zygote forms that develops into an embryo. Another sperm nucleus a. fuses with a primary endosperm cell to produce three cells, each with one nucleus. b. fuses with a primary endosperm cell to produce one cell with one diploid nucleus. c. fuses with the endosperm mother cell, forming a primary endosperm cell with a single triploid nucleus. d. fuses with one of the endosperm mother cell nuclei to produce a diploid tissue that serves as the food supply for the embryo. e. degenerates.

Biology & Microbiology

A difficult task for the biologist trying to determine if a group of organisms is a separate species is __________.

a. to compare appearances of different organisms b. to determine if a hybrid offspring is produced c. exposing isolating mechanisms d. determining whether group members breed with organisms outside the group e. comparing DNA from those

Biology & Microbiology

Describe at least three physical mechanisms that are part of the first line of defense

What will be an ideal response?

Biology & Microbiology