Describa en forma breve, los experimentos de Hans Spemann, en huevos de salamandra. ¿Qué conclusiones se pueden extraer de los Trabajos de Roux, Driesch y Spemann?

¿Qué función cumple la enzima conocida como fertilicina, durante el proceso de fecundación del cigote?

¿Qué función cumple la antifertilicina en el óvulo fecundado?

Will mark brainliest if correct/available! which of the following statements is true? all plants need flowers to sexually reproduce. sexually reproduced offspring are identical to their parents. fertilization always occurs inside the female's body. a body cell has twice the number of chromosomes as an egg cell.

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?