Here is your answer
C14 radio isotope decays into Nitrogen
HOPE IT IS USEFUL
Early Hominins are the hominin species recognized as the first species of the genus homo and lived approximately 2.5-1.8 million years ago.
Between 2.5 and 3 million years ago, the genus Homo initially made its appearance. For a long time, Homo habilis fossils were thought to be the oldest specimens of the genus Homo for a long time, but in 2010, a new species dubbed Homo gautengensis was found and maybe older.
Homo: a genus. The earliest remains of our own genus, Homo, date to 2.3 mya and are located in East Africa (Kimbel et al. 1997). These early individuals share the same size of the brain and body as Australopithecus, but their molar teeth differ, indicating a shift in nutrition.
The genus Homo belongs to the family Hominidae (order Primates), and it is distinguished by a relatively large cranium, limb anatomy that is suited to a habitual upright position, and a bipedal walk.
Learn to know more about Hominin species on
brainly.com/question/27632947
#SPJ4
Explanation:
For question no 19
Force (F) = 20N
distance (d) = 5m
Work = F * d
= 20 * 5
= 100 J
Now
For question no 20
D. No matter how much force is applied the object must have motion for work to be done.