We need carrier proteins for steroid hormones because they help in the transportation from the cell they were released from to their target cell.
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Answer:
A. Species that remained after the extinction were able to radiate, new adaptations arose, and these adaptations produced the diversity seen today.
Explanation:
When species went extinct they also left niches that could be occupied by "new" species; new places to live, places to be filled in the food web and different relationships to be formed. The wide availability of resources made organisms to radiate leading to a "new" diversity of shapes, sizes, and lifestyles.
B. Species that have gone extinct were able to re-evolve from the ancestors that survived the extinction. If you are extinct you are gone forever.
C. Species that remained after the extinction were unable to speciate. Therefore, the number of species on Earth today is lower than the number of species present just before either extinction. The fossil record proves that species have changed over time and the diversity has changed over the history of Earth.
D. Species that remained after the extinction represented all of the lineages that were present before the extinction event. Therefore, extinction did not change the diversity of lineages. Again, the fossil record is evidence that lineages have changed over the history of the Earth.
Answer: Organisms from all kingdoms of life. For example; <u>bacteria, archaea, plants, protists, animals, and fungi, can use cellular respiration.</u>
Explanation: <u>All organisms carry out cellular respiration in the mitochondria of their cells. They take in oxygen to convert glucose to usable ATP. In the process carbon is released as a waste. Plants and algae carry out photosynthesis in the chloroplasts of their cells.</u>
The factor that determines this is the atomic structure of these two elements which determines how many electrons are found on the outer shell or energy level of these elements.
Ability to form single, double or even multiple covalent bonds is directly dependent on the number of electrons on the outer energy level.
The atomic structure of oxygen 2:8:6 with the outer shell having 6 electrons. Oxygen readily accepts and share 2 more electrons from another element forming two covalent bonds.
Likewise carbon has an atomic structure of 2:4 with 4 electrons in the outer shell. It readily shares these electrons with other elements to form 4 covalent bonds with them.
