The image shows core samples of rock strata taken from three different regions on earth. all the fossils shown in the image are index fossils. identify the youngest layer and the oldest layer in the image. assume that no overturning took place.

Oldest layer - F3

Youngest layer - F2

Explanation:

The youngest Region  is region 1 and the oldest region is region 3. The fossils named F3 in the region 3 at the bottom is the oldest fossil. The fossil named F2 is the youngest layer.

It is given that no overturning happened. Thus, as we can see in region 1 Fossil f1 is at the base but the same fossil is at the second layer from top in region 2 and in region 3 there are more layers beneath this layer F1 and hence fossil named F3 is the oldest fossil among all.

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.  

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus