Which describes the notation Tt for the trait of being tall?
homozygous genotype
heterozygous genotype
homozygous phenotype
heterozygous phenotype

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Witch type of microscope is used to view very small cell components like proteins and dna?

What is the problem in this article? what solution does the article propose?