Explain why the chromosomes in the second drawing have sister chromatids, but the chromosomes in the third drawing do not. What happened to the sister chromatids?

According to the scientific method, how would you test a hypothesis? A) collect data B) conduct research C) design and conduct an experiment D) collect information on the Internet

True or false? Ice sinks in water.

Which part of the cells acts as a barrier to control what enters and leaves the cell?

if a strong odour smell continuously for sometime, the sensation of smell of that substance weaken ... why?

Which of the following statements about carotenoids is NOT true? Carotenoids include red, orange, and yellow pigments. Carotenoids are sometimes referred to as accessory pigments. Beta carotene is the most abundant carotene in plants.

What does natural selection act on

Where does cellular respiration occur? In the cytoplasm In the mitochondrion < - - In the cell membrane In the chlorophyll

People generally know that citrus fruits are good food sources of vitamin C, but there are plenty of non-citrus sources as well. What are some of the non-citrus foods are good sources of vitamin C?

what is the presence of different genes on the same chromosome, is it linkage?, diploid?, haploid?, autosome?, or chromosome theory

Which of the following statements about hormones are correct? (A) Hormones can be peptides, steroids, or amino acid derivatives. (B) Hormones can stimulate the synthesis of target proteins through the activation of specific genes.