2.- Señale la opción incorrecta: a) las bacterias pueden liberar sustancias llamadas toxinas que producen enfermedad b) parasito es todo ser vivo que vive a expensas de su huésped c) la inmunidad puede ser congénita o adquirida d) las vacunas y los sueros nos dan inmunidad, pero hay diferencias entre ellos e) la inmunidad adquirida es congénita

What was the indication to Richard Owen that the fossils he had found were not like other reptiles? A) They were found in climates where scientists know reptiles cannot survive. B) They had five vertebrae, and their limbs did not sprawl t the side, but were upright. Chey did not have any vertebrae, and their limbs sprawled out to the side rather than upright. (D) They were much smaller than any other bones that had ever been found.

3. What does the article suggest about the effectiveness of measures like wearing masks and social distancing in controlling the virus's spread? 4. How did the pandemic alter daily routines for students and their families, and what can you infer about the challenges they faced? 5 . What can be inferred about the importance of vaccines in reducing COVID-19 cases in the United States?

According to the text, how is the water amount reduced in underground aquifers? (A) Plant roots remove the water. (B) Snow melts and soaks into the ground. (C) Gravity moves the water into streams. (D) People pump water from them.

population d'une espèce animale dans une réserve. Cette population est estimée a 12000 individus en 2020. Les contraintes du milieu naturel font que la population ne peut pas dépasser les 60000 individus. Partie \( A \). Un premier modèle Dans une première approche, la biologiste estime que la population croit de \( 5 \% \) par an. L'évolution annuelle de la population est ainsi modé- lisée par une suite \( \left(v_{n}\right) \), où \( v_{n} \) représente le nombre d'individus, exprimé en millier, l'année ( \( 2020+n) \). On a donc \( v_{0}=12 \). 1. Déterminer la nature de la suite \( \left(v_{n}\right) \) et donner l'expression de \( v_{n} \) en fonction de \( n \). 2. Ce modèle répond-il aux contraintes du milieu naturel?

Why is Ardi such an important development? (A) It proves the connection between Antarctica and Australia. B It shows fossil records of how interconnected all of humanity is. (C) It lends credibility to the idea that humans originated in Mongolia. (D) It is even older than Lucy, another human ancestor fossil.