Which two structures would provide a positive identification of an animal cell under a microscope?

a. lysosome, flagellum
b. golgi apparatus, mitochondrion
c. plasma membrane, endoplasmic reticulum
d. cell wall, chromatin

Aplant has an egg with 34 chromosomes how many chromosomes does a leaf cell of that plant have

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

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?