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.
You might also like to view...
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.
What is the key concept addressed by the question?
What will be an ideal response?
Sharks that are __________ incubate their eggs in the uterus
a. oviparous b. viviparous c. ovoviviparous d. placental e. eutherial
if DNA is damaged and can't be repaired,
What will be an ideal response?