Microtubules are hollow tubes of protein that maintain cell shape and permit movement of cell organelles.
Answer: Alveoli
Explanation: Alveoli of lungs are surrounded by extensive blood capillaries. The partial pressure of oxygen in the alveoli is higher than the blood entering the pulmonary capillaries, hence oxygen moves into the blood. Carbon dioxide in the lungs simultaneously diffuse out of the blood into the alveolar space.
Answer:
In situations where the population density of a given species exceeds the ecosystem’s carrying capacity, the species will deplete its source of food, water, or other necessities. Soon, the population will begin dying off. A population can only grow until it reaches the carrying capacity of the environmen
Answer:
D. They can cause changes in body shape
Explanation:
Homeotic genes are evolutionarily conserved genes that regulate the development of body parts. Mutations in these genes can eventually produce changes in body patterning. In animals, for example, Hox genes are homeotic genes that encode transcription factors which contain evolutionary conserved DNA binding region (i.e., homeodomain). Both in invertebrates and vertebrates, Hox genes (Hox) play key roles in global body patterning. In plants, MADS-box genes are well-known homeotic genes that have key roles during embryo, inflorescence and flower development.
Answer:
Certain gases in the atmosphere resemble glass in a greenhouse, allowing sunlight to pass into the 'greenhouse,' but blocking Earth's heat from escaping into space. The gases that contribute to the greenhouse effect include water vapor, carbon dioxide (CO2), methane, nitrous oxides, and chlorofluorocarbons
Explanation: