Most animal and plant species we see in the fossil record are extinct, or no longer living. In fact, of all the species that ever lived, 98% are extinct. Animals and plants become extinct over time as a result of natural processes. Their habitat might change or a disease might wipe out a species.
Answer: By either emigration or natural increase.
Explanation: Natural increase is where in a population, the birth rate, or number of live births per year, is greater than the death rate, or deaths per year. Emigration is when individuals leave their region to move to another, often due to economic or political reasons. Eventually, a population will reach its carrying capacity, where the land the population occupies is only just able to support the population. Once the carrying capacity is breached, the population will start to collapse.
Answer:
D) integrins
Explanation:
The extracellular matrix is an intricate network of carbohydrates and proteins in the cells extracellular space. <em>Collagen proteins </em>undergo modification with carbohydrates within the cell to form collagen fibers; they are interwoven with proteoglycan complexes is made up of carbohydrates proteins and polysaccharides. The resulting mesh is capable of providing structural integrity, mechanical strength and support to tissue.
In the ECM, the fibers are joined to integrins by fibrobronectin bridges. Integrin proteins form crucial connections between surrounding cells, are embedded within the cells' plasma membranes and anchors them in the ECM. Also, they facilitate cell communication in the environment- <u>they are capable of detecting mechanical and chemical signals</u> from the ECM and respond by stimulating signal pathways inside the cell.
Answer: If this is the image you are talking about, I am able to answer your question.
These are the answers to the question.
A. Birds and amphibians have no similarities in their amino acid sequences.
B. Reptile embryos are similar to birds but have no similarities with mammals and amphibians.
C. Mammals have more genes in common with birds than with amphibians.
D. Amphibians and mammals have similar traits that are not seen in reptiles and birds.
Explanation: C really just makes the most sense to me. Compare answer C to what is in the picture and you will see what I mean.
Today is my last day, so have a great summer!