Which type of star cluster forms from tightly packed groups of older stars?

Describe at least 2 abiotic and two biotic factors found in the desert biome how do these abiotic factors interact with the biotic factors

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent