How many sperm do you make from one spermatogonia

Which of the following is NOT an example of a fossil? a. a hardened footprint left by an animal b. an insect trapped in amber c. a petrified plant d. an ancient rock found in a dry riverbed

if research is restricted. then the new discoveries made are limited. which action is most likely to increase the number of discoveries scientist can make?

Martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:martha's child was born with an extra chromosome resulting in down syndrome. this is an example of:

A neutral iron molecule has an atomic number of 26. How many electrons does this atom have? Explain the reason you used to get your answer

What element is found in both dna and protein

3 physical characteristics of humans affected by the environment?

What is indirect competition in biology terms

A muscle cramp is most likely due to lack of A) ATP. B) ADP. C) actin. D) myosin. E) acetylcholine.

Why is speech the easiest modality for communication?

Which statements describe the cyclic nature of seafloor spreading? Check all that apply. a) Continents are created. b) New oceanic crust is created. c) Volcanoes erupt and produce more crust. d) Old crust is destroyed at subduction zones.