There are all sorts of ways to reconstruct the history of life on Earth. Pinning down when specific events occurred is often tricky, though. For this, biologists depend mainly on dating the rocks in which fossils are found, and by looking at the “molecular clocks” in the DNA of living organisms.
There are problems with each of these methods. The fossil record is like a movie with most of the frames cut out. Because it is so incomplete, it can be difficult to establish exactly when particular evolutionary changes happened.
Modern genetics allows scientists to measure how different species are from each other at a molecular level, and thus to estimate how much time has passed since a single lineage split into different species. Confounding factors rack up for species that are very distantly related, making the earlier dates more uncertain.
These difficulties mean that the dates in the timeline should be taken as approximate. As a general rule, they become more uncertain the further back along the geological timescale we look. Dates that are very uncertain are marked with a question mark.
D.)The enzyme changes shape and no longer fits the substrate.
High temp causes enzymes to speed up the reaction but too much heat and the enzyme might denature, losing its shape.
Answer:
the centrioles are at opposite poles of the cell
the pairs of homologous chromosomes become arranged on a plane equidistant from the poles called the metaphase plate
spindle fibers from one pole of the cell attach to one chromosome of each pair and spindle fibers from the opposite poles attach to the homologous chromosomes
<span>peer review means to let someone who is your peer, review your work.
</span>They review another's one work, give suggestions, and help edit the paper.<span> </span>
Answer:
its like your own land but only sertin people can go on it... I'm no tired sure tho thats what I think it is
Explanation:
if I'm right mark me has brainliest??
