Biologists usually classify things according to their:
a. appearance
b. habitat
c. when they lived
Ans: a. appearance
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Which of the following combinations represent prezygotic mechanisms of isolation?
a. hybrid breakdown and temporal isolation b. hybrid breakdown and gametic isolation c. hybrid sterility and temporal isolation d. mechanical and temporal isolation e. mechanical and hybrid breakdown
Which statement is true?
a. Haversian canals allow veins and arteries to pass through muscle tissue. b. Canaliculi help to maintain body temperature and protect internal organs. c. Trabeculae are plates that provide structural support to spongy bone tissue. d. Osteoclasts are mutated bone cells that injure the organism by destroying bones.
The female gametophyte is the
a. flower. b. ovule. c. embryo sac. d. carpel. e. ovary.
The structural unit of compact bone. Consists of an elongated cylinder that runs parallel to long axis of bone. Acts as tiny-weight bearing pillars. Consists of lamellae.
What will be an ideal response?