The correct answer is - The Mesohippus is older than the Pliohippus.
Trying to date the fossils according to the layers in which they are found can be very useful and relatively accurate. It has to be taken in consideration though that the layers of rocks should not be disturbed by geological processes, as that can give totally different results.
In this case, the fossils of the Pliohippus are found in layers closer to the surface, while the fossils of the Mesohippus are found in layers that further down, bellow the layers in which the Pliohippus fossils are found. This means that the Pliohippus is an animal that lived after the Mesohippus lived, thus making it a younger species, while the Mesohippus would be the older species.
Labeling the parts of a cell on a diagram is an example of an excercise in ANATOMY
Answer:
b) Channel pumps
Explanation:
The channels are the transmembrane proteins that serve in the passive transport of substances down the concentration gradient. The channels can be gated or non-gated. The gated channels are opened and closed in response to certain stimuli such as electrical change.
For example, aquaporins are the gated water channels that transport the water across the plasma membrane. The process is driven by the osmotic gradient and does not use the energy of ATP.
T cell receptor, Cytotoxic T Cell, CD4, Antigen, Bacterium,
B – cell, Cell mediated response, Class II MHC, Cytokines, and Humoral Response
are the components for the activation of a helper t cell by a dendritic cell.
The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water.
