Un bebé recién nacido tiene cerca de 26000000000 células. Un adulto tiene cerca de 4,94 - \( 10^{13} \) células. ¿Cuántas células más tiene un adulto que un recién nacido? Escribe la respuesta en notación científica.

Choose the most suitable answer. IMark Which of the following statements about bacteria are true? W Bacteria is an example of a microorganism. X Bacteria may be useful or harmful to man. Y Bacteria can be found everywhere around us. Z Bacteria can be seen with the microscope.

An unknown microbial specimen measures 18 millimetres under a total magnification of 400 x , when examined under the microscope. What is the actual size of the unknown specimen? \( \begin{array}{ll}\text { (A) } 45 \text { micrometres. Total magnification }=400 x \\ \text { (B) } 4.5 \text { micrometres. } \quad \frac{18}{400 x}=0.045 \mathrm{~mm} \\ \text { (C) } 0.45 \text { micrometres. } \\ \text { (D) } 0.045 \text { micrometres. } & \text { micrometers }=0.045 \times 1000=45 \text { micrometers }\end{array} \)

3. Which of the ff. is a producer? \( \begin{array}{ll}\text { a. fish } \quad \text { b. shrimp } \quad \text { c. algae } \quad \text { d. crab }\end{array} \) \( \begin{array}{l}\text { 4.All the organisms below are decomposers except } \\ \text { a. fungi } \quad \text { c. bacteria } \\ \text { b. sea lion } \quad \text { d. fungi and bacteria } \\ \text { 5. Arrange the feeding relationship of the ff. organisms living in } \\ \text { intertidal zone }\end{array} \) Fish ------seaweeds------shore birds

Which of the following anterior teeth have a cingulum that is located off-center toward the distal? a) Maxillary lateral incisorb) Maxillary caninec) Mandibular central incisord) Maxillary central incisor

Choose the most suitable answer. IMark Mushrooms and mould belong to the group of living things called fungi. How are they similar? P They cannot make their own food. Q They reproduce from spores. R They can only be seen with a microscope.