The first eukaryotic cell is thought to have evolved at least million years ago.

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3: 1. if the allele are designated (r & r) receptively. what is the probable genotypes of the round seeds which produced f 1 ? rr & rr rr only rr & rr rr only rr only

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs