All of the following have an internal skeleton except

a. sand dollars.

b. sand fleas.

c. sea stars.

d. sea lilies.

Dna is made of two chains of nucleotides. which type of bonds hold the chains together? hydrogen bonds covalent bonds ionic bonds polar covalent bonds

When testing fertillizer on a tomato farm, one patch of soil is given fertillizer and another patch (the same size) is not. which one is the experimental group

How does the digestive system work at the tissue level? Will give brainiest.

Which structure connects the testes to the urethra?

Enzymes can increase the rates of reactions over a miltion fold but they do not accomplish this by a) Lowering the activation eneray of the reaction b) Changing the equllbrium of the reaction c) Highly specific binding of substrates d) Stabilizing

Which lists the structures, in correct order, through which light passes when it enters the eye? cones, pupil, lens, sclera, sclera, iris, pupil, lens vitreous humor, lens, pupil, cornea cornea, pupil, lens, vitreous humor

Which of the following does not require a medium through which to travel in word which can travel through empty space

When you eat a bag of cookies, your blood sugar level increases. As blood sugar levels rise, insulin levels increase to move the sugar into the cells and lower the blood sugar level. As the blood sugar level drops, so does the level of insulin.

Mendel's law of independent assortment has its basis in which of the following events of meiosis I?

Describe a procedure humans may have used to produce broccoli, which has small flowers and thick stems?