Which cells have tiny holes through which nutrients move from cell to cell?

sieve tube

elements

tracheids

vessel elements

What are the key skeletal anatomical features that humans share with great apes?

A person with blood group A produces antibodies against B. A person with blood group B produces antibodies against A. A person with blood group AB produces no antibodies. How can you explain this? a. A and B alleles are co-dominant.

What do cells gain from having mitochondria and chloroplasts

Barn owls can eat up to 10 rodents per day. Farmers have constructed 60 "nesting boxesin this valley for the owls to use as their homes, which gives their babies a safe place to hatch. How will this affect the rodent population?

Identify the statement that correctly represents how light travels.

Select the correct statement about antigens. A. One antigen may have many different antigenic determinants and may therefore cause the formation of more than one antibody. B. Only small antigens exhibit reactivity. C.

Which molecule is the source of basic material used for the production of glucose in the calvin cycle?

Why do cells need to be able to transport substances across their membrane

Which is a characteristic of all waves?

What does the heart do?