The cause is the immune system producing antibodies that attack the platelets in blood
Answer:
Constant variables
Explanation:
Elaina's investigation lacked the critical ingredient of constant variables which are important components of every scientific investigation. In every research, there are 3 important variables, namely:
1. Dependent variables: the actual variable to be measured during the course of investigations and whose values are dependent on another variable (independent variable) supplied by the investigators.
2. Independent variable: one of the variables that are supplied by investigators whose values are often manipulated to see the kind of changes it will cause to the dependent variable.
3. Constant variables: other variables that are neither independent nor dependent but constant for all the various experimental groups in investigations.
The answer is c. alleles that are carried on X and Y chromosomes.
Sex-linked traits are those traits which inheritance depends on sex chromosomes. Sex chromosomes are X and Y. Women have two X chromosomes, while men have one X and one Y chromosome. One those chromosomes are genes responsible for some sex-linked traits. As genes on the other chromosomes, genes on sex chromosomes as well have different forms called alleles. Therefore, alleles that are carried on X and Y chromosomes (sex chromosomes) best describe sex-linked traits.
false statement: the cuticle slows down the loss of water in a leaf.