Answer: mutations that natural selection can work on. 4.) How do scientists calibrate a molecular clock? ... they compare the number of positive mutations that have occurred in a particular species with the number of negative mutations that have occurred
Explanation:
E; translocation, which is a chromosomal rearrangement in which a part of genetic material from one chromosome becomes heritably (genetically) tied to another chromosome.*
Sources:
*Definition of "Translocation" (Paraphrase):
http://www.dictionary.com/browse/translocation?s=t
The Philadelphia Chromosome:
https://www.medicinenet.com/script/main/art.asp?articlekey=4870
Before you faint, you feel dizzy. The dizziness is from the light headedness.
The correct answer is B. Ordovician period
Explanation:
Plants are mainly multicellular organism that depends mainly on photosynthesis to obtain energy, this includes a wide variety of species such as grass, flowering plants, trees, shrubs, etc. Additionally, plants are considered as one f the two major divisions or kingdoms along with animals. In terms of history, it has been determined first land plants appear during the mid-Ordovician period around 470 million ago, although organisms that were the origin of land plants developed in water in previous periods, also by the Devonian period a wide variety of plants have emerged with features that are still part of plants nowadays. Therefore, plant life first appeared on land during the Ordovician period.