Hey guys could you help me??? What does a chromosome consist of?

A.
tightly wound DNA and proteins
B.
tightly wound DNA only
C.
loosely dispersed DNA
D.
loosely dispersed DNA and proteins

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.