The Earth formed approximately

(a) 4600 years ago.
(b) 1 million years ago.
(c) 1 billion years ago.
(d) 4.6 billion years ago.


(d) 4.6 billion years ago.

Biology & Microbiology

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A newborn is identified as having sickle-cell anemia. While both parents are healthy, a screening of both parents will most likely reveal:

A. both mother and father are carriers of a mutant ? chain gene. B. only one parent has a mutant ? chain gene since mutation is dominant. C. both mother and father are carriers of a mutant ? chain gene. D. only one parent has a mutant ? chain gene since mutation is dominant. E. both parents carry a mutant hemoglobin gene and are highly susceptible to malaria.

Biology & Microbiology

What is the key concept addressed by the question?

What will be an ideal response?

Biology & Microbiology

Sharks that are __________ incubate their eggs in the uterus

a. oviparous b. viviparous c. ovoviviparous d. placental e. eutherial

Biology & Microbiology

if DNA is damaged and can't be repaired,

What will be an ideal response?

Biology & Microbiology